diff --git a/packages/backend/src/core/ChatService.ts b/packages/backend/src/core/ChatService.ts
index 75445307cc..6b09c44baf 100644
--- a/packages/backend/src/core/ChatService.ts
+++ b/packages/backend/src/core/ChatService.ts
@@ -16,13 +16,15 @@ import { ChatEntityService } from '@/core/entities/ChatEntityService.js';
 import { ApRendererService } from '@/core/activitypub/ApRendererService.js';
 import { PushNotificationService } from '@/core/PushNotificationService.js';
 import { bindThis } from '@/decorators.js';
-import type { ChatApprovalsRepository, ChatMessagesRepository, ChatRoomInvitationsRepository, ChatRoomMembershipsRepository, ChatRoomsRepository, MiChatMessage, MiChatRoom, MiDriveFile, MiUser, MutingsRepository, UsersRepository } from '@/models/_.js';
+import type { ChatApprovalsRepository, ChatMessagesRepository, ChatRoomInvitationsRepository, ChatRoomMembershipsRepository, ChatRoomsRepository, MiChatMessage, MiChatRoom, MiChatRoomMembership, MiDriveFile, MiUser, MutingsRepository, UsersRepository } from '@/models/_.js';
 import { UserBlockingService } from '@/core/UserBlockingService.js';
 import { QueryService } from '@/core/QueryService.js';
 import { RoleService } from '@/core/RoleService.js';
 import { UserFollowingService } from '@/core/UserFollowingService.js';
 import { MiChatRoomInvitation } from '@/models/ChatRoomInvitation.js';
 
+const MAX_ROOM_MEMBERS = 30;
+
 @Injectable()
 export class ChatService {
 	constructor(
@@ -463,6 +465,22 @@ export class ChatService {
 		await this.chatRoomsRepository.delete(room.id);
 	}
 
+	@bindThis
+	public async findMyRoomById(ownerId: MiUser['id'], roomId: MiChatRoom['id']) {
+		return this.chatRoomsRepository.findOneBy({ id: roomId, ownerId: ownerId });
+	}
+
+	@bindThis
+	public async findRoomById(roomId: MiChatRoom['id']) {
+		return this.chatRoomsRepository.findOneBy({ id: roomId });
+	}
+
+	@bindThis
+	public async isRoomMember(roomId: MiChatRoom['id'], userId: MiUser['id']) {
+		const membership = await this.chatRoomMembershipsRepository.findOneBy({ roomId, userId });
+		return membership != null;
+	}
+
 	@bindThis
 	public async createRoomInvitation(inviterId: MiUser['id'], roomId: MiChatRoom['id'], inviteeId: MiUser['id']) {
 		if (inviterId === inviteeId) {
@@ -471,6 +489,16 @@ export class ChatService {
 
 		const room = await this.chatRoomsRepository.findOneByOrFail({ id: roomId, ownerId: inviterId });
 
+		const existingInvitation = await this.chatRoomInvitationsRepository.findOneBy({ roomId, userId: inviteeId });
+		if (existingInvitation) {
+			throw new Error('already invited');
+		}
+
+		const membershipsCount = await this.chatRoomMembershipsRepository.countBy({ roomId });
+		if (membershipsCount >= MAX_ROOM_MEMBERS) {
+			throw new Error('room is full');
+		}
+
 		// TODO: cehck block
 
 		const invitation = {
@@ -483,4 +511,80 @@ export class ChatService {
 
 		return created;
 	}
+
+	@bindThis
+	public async getOwnedRoomsWithPagination(ownerId: MiUser['id'], limit: number, sinceId?: MiChatRoom['id'] | null, untilId?: MiChatRoom['id'] | null) {
+		const query = this.queryService.makePaginationQuery(this.chatRoomsRepository.createQueryBuilder('room'), sinceId, untilId)
+			.where('room.ownerId = :ownerId', { ownerId });
+
+		const rooms = await query.take(limit).getMany();
+
+		return rooms;
+	}
+
+	@bindThis
+	public async getReceivedRoomInvitationsWithPagination(userId: MiUser['id'], limit: number, sinceId?: MiChatRoomInvitation['id'] | null, untilId?: MiChatRoomInvitation['id'] | null) {
+		const query = this.queryService.makePaginationQuery(this.chatRoomInvitationsRepository.createQueryBuilder('invitation'), sinceId, untilId)
+			.where('invitation.userId = :userId', { userId });
+
+		const invitations = await query.take(limit).getMany();
+
+		return invitations;
+	}
+
+	@bindThis
+	public async joinToRoom(userId: MiUser['id'], roomId: MiChatRoom['id']) {
+		const invitation = await this.chatRoomInvitationsRepository.findOneByOrFail({ roomId, userId });
+
+		const membershipsCount = await this.chatRoomMembershipsRepository.countBy({ roomId });
+		if (membershipsCount >= MAX_ROOM_MEMBERS) {
+			throw new Error('room is full');
+		}
+
+		const membership = {
+			id: this.idService.gen(),
+			roomId: roomId,
+			userId: userId,
+		} satisfies Partial<MiChatRoomMembership>;
+
+		// TODO: transaction
+		await this.chatRoomMembershipsRepository.insertOne(membership);
+		await this.chatRoomInvitationsRepository.delete(invitation.id);
+	}
+
+	@bindThis
+	public async rejectRoomInvitation(userId: MiUser['id'], roomId: MiChatRoom['id']) {
+		const invitation = await this.chatRoomInvitationsRepository.findOneByOrFail({ roomId, userId });
+		await this.chatRoomInvitationsRepository.delete(invitation.id);
+	}
+
+	@bindThis
+	public async leaveRoom(userId: MiUser['id'], roomId: MiChatRoom['id']) {
+		const membership = await this.chatRoomMembershipsRepository.findOneByOrFail({ roomId, userId });
+		await this.chatRoomMembershipsRepository.delete(membership.id);
+	}
+
+	@bindThis
+	public async updateRoom(room: MiChatRoom, params: {
+		name?: string;
+	}): Promise<MiChatRoom> {
+		return this.chatRoomsRepository.createQueryBuilder().update()
+			.set(params)
+			.where('id = :id', { id: room.id })
+			.returning('*')
+			.execute()
+			.then((response) => {
+				return response.raw[0];
+			});
+	}
+
+	@bindThis
+	public async getRoomMembershipsWithPagination(roomId: MiChatRoom['id'], limit: number, sinceId?: MiChatRoomMembership['id'] | null, untilId?: MiChatRoomMembership['id'] | null) {
+		const query = this.queryService.makePaginationQuery(this.chatRoomMembershipsRepository.createQueryBuilder('membership'), sinceId, untilId)
+			.where('membership.roomId = :roomId', { roomId });
+
+		const memberships = await query.take(limit).getMany();
+
+		return memberships;
+	}
 }
diff --git a/packages/backend/src/core/entities/ChatEntityService.ts b/packages/backend/src/core/entities/ChatEntityService.ts
index 6cb67df5cf..4fd2ed5702 100644
--- a/packages/backend/src/core/entities/ChatEntityService.ts
+++ b/packages/backend/src/core/entities/ChatEntityService.ts
@@ -5,7 +5,7 @@
 
 import { Inject, Injectable } from '@nestjs/common';
 import { DI } from '@/di-symbols.js';
-import type { MiUser, ChatMessagesRepository, MiChatMessage, ChatRoomsRepository, MiChatRoom } from '@/models/_.js';
+import type { MiUser, ChatMessagesRepository, MiChatMessage, ChatRoomsRepository, MiChatRoom, MiChatRoomInvitation, ChatRoomInvitationsRepository, MiChatRoomMembership, ChatRoomMembershipsRepository } from '@/models/_.js';
 import { awaitAll } from '@/misc/prelude/await-all.js';
 import type { Packed } from '@/misc/json-schema.js';
 import type { } from '@/models/Blocking.js';
@@ -23,6 +23,12 @@ export class ChatEntityService {
 		@Inject(DI.chatRoomsRepository)
 		private chatRoomsRepository: ChatRoomsRepository,
 
+		@Inject(DI.chatRoomInvitationsRepository)
+		private chatRoomInvitationsRepository: ChatRoomInvitationsRepository,
+
+		@Inject(DI.chatRoomMembershipsRepository)
+		private chatRoomMembershipsRepository: ChatRoomMembershipsRepository,
+
 		private userEntityService: UserEntityService,
 		private driveFileEntityService: DriveFileEntityService,
 		private idService: IdService,
@@ -206,4 +212,72 @@ export class ChatEntityService {
 
 		return Promise.all(rooms.map(room => this.packRoom(room, me, { _hint_: { packedOwners } })));
 	}
+
+	@bindThis
+	public async packRoomInvitation(
+		src: MiChatRoomInvitation['id'] | MiChatRoomInvitation,
+		me: { id: MiUser['id'] },
+		options?: {
+			_hint_?: {
+				packedRooms: Map<MiChatRoomInvitation['roomId'], Packed<'ChatRoom'>>;
+				packedUsers: Map<MiChatRoomInvitation['id'], Packed<'UserLite'>>;
+			};
+		},
+	): Promise<Packed<'ChatRoomInvitation'>> {
+		const invitation = typeof src === 'object' ? src : await this.chatRoomInvitationsRepository.findOneByOrFail({ id: src });
+
+		return {
+			id: invitation.id,
+			createdAt: this.idService.parse(invitation.id).date.toISOString(),
+			roomId: invitation.roomId,
+			room: options?._hint_?.packedRooms.get(invitation.roomId) ?? await this.packRoom(invitation.room ?? invitation.roomId, me),
+			userId: invitation.userId,
+			user: options?._hint_?.packedUsers.get(invitation.userId) ?? await this.userEntityService.pack(invitation.user ?? invitation.userId, me),
+		};
+	}
+
+	@bindThis
+	public async packRoomInvitations(
+		invitations: MiChatRoomInvitation[],
+		me: { id: MiUser['id'] },
+	) {
+		if (invitations.length === 0) return [];
+
+		return Promise.all(invitations.map(invitation => this.packRoomInvitation(invitation, me)));
+	}
+
+	@bindThis
+	public async packRoomMembership(
+		src: MiChatRoomMembership['id'] | MiChatRoomMembership,
+		me: { id: MiUser['id'] },
+		options?: {
+			_hint_?: {
+				packedUsers: Map<MiChatRoomMembership['id'], Packed<'UserLite'>>;
+			};
+		},
+	): Promise<Packed<'ChatRoomMembership'>> {
+		const membership = typeof src === 'object' ? src : await this.chatRoomMembershipsRepository.findOneByOrFail({ id: src });
+
+		return {
+			id: membership.id,
+			createdAt: this.idService.parse(membership.id).date.toISOString(),
+			userId: membership.userId,
+			user: options?._hint_?.packedUsers.get(membership.userId) ?? await this.userEntityService.pack(membership.user ?? membership.userId, me),
+		};
+	}
+
+	@bindThis
+	public async packRoomMemberships(
+		memberships: MiChatRoomMembership[],
+		me: { id: MiUser['id'] },
+	) {
+		if (memberships.length === 0) return [];
+
+		const users = memberships.map(x => x.user ?? x.userId);
+
+		const packedUsers = await this.userEntityService.packMany(users, me)
+			.then(users => new Map(users.map(u => [u.id, u])));
+
+		return Promise.all(memberships.map(membership => this.packRoomMembership(membership, me, { _hint_: { packedUsers } })));
+	}
 }
diff --git a/packages/backend/src/misc/json-schema.ts b/packages/backend/src/misc/json-schema.ts
index 9440cf8f52..bc9308ca9b 100644
--- a/packages/backend/src/misc/json-schema.ts
+++ b/packages/backend/src/misc/json-schema.ts
@@ -65,6 +65,8 @@ import { packedSystemWebhookSchema } from '@/models/json-schema/system-webhook.j
 import { packedAbuseReportNotificationRecipientSchema } from '@/models/json-schema/abuse-report-notification-recipient.js';
 import { packedChatMessageSchema, packedChatMessageLiteSchema } from '@/models/json-schema/chat-message.js';
 import { packedChatRoomSchema } from '@/models/json-schema/chat-room.js';
+import { packedChatRoomInvitationSchema } from '@/models/json-schema/chat-room-invitation.js';
+import { packedChatRoomMembershipSchema } from '@/models/json-schema/chat-room-membership.js';
 
 export const refs = {
 	UserLite: packedUserLiteSchema,
@@ -125,6 +127,8 @@ export const refs = {
 	ChatMessage: packedChatMessageSchema,
 	ChatMessageLite: packedChatMessageLiteSchema,
 	ChatRoom: packedChatRoomSchema,
+	ChatRoomInvitation: packedChatRoomInvitationSchema,
+	ChatRoomMembership: packedChatRoomMembershipSchema,
 };
 
 export type Packed<x extends keyof typeof refs> = SchemaType<typeof refs[x]>;
diff --git a/packages/backend/src/models/json-schema/chat-room-invitation.ts b/packages/backend/src/models/json-schema/chat-room-invitation.ts
new file mode 100644
index 0000000000..204c959b2c
--- /dev/null
+++ b/packages/backend/src/models/json-schema/chat-room-invitation.ts
@@ -0,0 +1,37 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+export const packedChatRoomInvitationSchema = {
+	type: 'object',
+	properties: {
+		id: {
+			type: 'string',
+			optional: false, nullable: false,
+		},
+		createdAt: {
+			type: 'string',
+			format: 'date-time',
+			optional: false, nullable: false,
+		},
+		userId: {
+			type: 'string',
+			optional: false, nullable: false,
+		},
+		user: {
+			type: 'object',
+			optional: false, nullable: false,
+			ref: 'UserLite',
+		},
+		roomId: {
+			type: 'string',
+			optional: false, nullable: false,
+		},
+		room: {
+			type: 'object',
+			optional: false, nullable: false,
+			ref: 'ChatRoom',
+		},
+	},
+} as const;
diff --git a/packages/backend/src/models/json-schema/chat-room-membership.ts b/packages/backend/src/models/json-schema/chat-room-membership.ts
new file mode 100644
index 0000000000..b8a8e1bf7b
--- /dev/null
+++ b/packages/backend/src/models/json-schema/chat-room-membership.ts
@@ -0,0 +1,28 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+export const packedChatRoomMembershipSchema = {
+	type: 'object',
+	properties: {
+		id: {
+			type: 'string',
+			optional: false, nullable: false,
+		},
+		createdAt: {
+			type: 'string',
+			format: 'date-time',
+			optional: false, nullable: false,
+		},
+		userId: {
+			type: 'string',
+			optional: false, nullable: false,
+		},
+		user: {
+			type: 'object',
+			optional: false, nullable: false,
+			ref: 'UserLite',
+		},
+	},
+} as const;
diff --git a/packages/backend/src/server/api/endpoint-list.ts b/packages/backend/src/server/api/endpoint-list.ts
index 07080f86ff..a1bf63003b 100644
--- a/packages/backend/src/server/api/endpoint-list.ts
+++ b/packages/backend/src/server/api/endpoint-list.ts
@@ -400,5 +400,16 @@ export * as 'chat/messages/create' from './endpoints/chat/messages/create.js';
 export * as 'chat/messages/delete' from './endpoints/chat/messages/delete.js';
 export * as 'chat/messages/show' from './endpoints/chat/messages/show.js';
 export * as 'chat/messages/timeline' from './endpoints/chat/messages/timeline.js';
+export * as 'chat/rooms/create' from './endpoints/chat/rooms/create.js';
+export * as 'chat/rooms/delete' from './endpoints/chat/rooms/delete.js';
+export * as 'chat/rooms/join' from './endpoints/chat/rooms/join.js';
+export * as 'chat/rooms/leave' from './endpoints/chat/rooms/leave.js';
+export * as 'chat/rooms/show' from './endpoints/chat/rooms/show.js';
+export * as 'chat/rooms/owned' from './endpoints/chat/rooms/owned.js';
+export * as 'chat/rooms/update' from './endpoints/chat/rooms/update.js';
+export * as 'chat/rooms/members' from './endpoints/chat/rooms/members.js';
+export * as 'chat/rooms/invitations/create' from './endpoints/chat/rooms/invitations/create.js';
+export * as 'chat/rooms/invitations/reject' from './endpoints/chat/rooms/invitations/reject.js';
+export * as 'chat/rooms/invitations/inbox' from './endpoints/chat/rooms/invitations/inbox.js';
 export * as 'chat/history' from './endpoints/chat/history.js';
 export * as 'v2/admin/emoji/list' from './endpoints/v2/admin/emoji/list.js';
diff --git a/packages/backend/src/server/api/endpoints/chat/messages/delete.ts b/packages/backend/src/server/api/endpoints/chat/messages/delete.ts
index 14957eeece..959599ddcf 100644
--- a/packages/backend/src/server/api/endpoints/chat/messages/delete.ts
+++ b/packages/backend/src/server/api/endpoints/chat/messages/delete.ts
@@ -6,9 +6,7 @@
 import { Inject, Injectable } from '@nestjs/common';
 import { Endpoint } from '@/server/api/endpoint-base.js';
 import { DI } from '@/di-symbols.js';
-import { GetterService } from '@/server/api/GetterService.js';
 import { ChatService } from '@/core/ChatService.js';
-import { ChatEntityService } from '@/core/entities/ChatEntityService.js';
 import { ApiError } from '@/server/api/error.js';
 
 export const meta = {
diff --git a/packages/backend/src/server/api/endpoints/chat/rooms/delete.ts b/packages/backend/src/server/api/endpoints/chat/rooms/delete.ts
index e69de29bb2..2ef0a778f1 100644
--- a/packages/backend/src/server/api/endpoints/chat/rooms/delete.ts
+++ b/packages/backend/src/server/api/endpoints/chat/rooms/delete.ts
@@ -0,0 +1,52 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { Inject, Injectable } from '@nestjs/common';
+import { Endpoint } from '@/server/api/endpoint-base.js';
+import { DI } from '@/di-symbols.js';
+import { ChatService } from '@/core/ChatService.js';
+import { ApiError } from '@/server/api/error.js';
+
+export const meta = {
+	tags: ['chat'],
+
+	requireCredential: true,
+
+	kind: 'write:chat',
+
+	res: {
+	},
+
+	errors: {
+		noSuchRoom: {
+			message: 'No such room.',
+			code: 'NO_SUCH_ROOM',
+			id: 'd4e3753d-97bf-4a19-ab8e-21080fbc0f4b',
+		},
+	},
+} as const;
+
+export const paramDef = {
+	type: 'object',
+	properties: {
+		roomId: { type: 'string', format: 'misskey:id' },
+	},
+	required: ['roomId'],
+} as const;
+
+@Injectable()
+export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
+	constructor(
+		private chatService: ChatService,
+	) {
+		super(meta, paramDef, async (ps, me) => {
+			const room = await this.chatService.findMyRoomById(me.id, ps.roomId);
+			if (room == null) {
+				throw new ApiError(meta.errors.noSuchRoom);
+			}
+			await this.chatService.deleteRoom(room);
+		});
+	}
+}
diff --git a/packages/backend/src/server/api/endpoints/chat/rooms/invitations/accept.ts b/packages/backend/src/server/api/endpoints/chat/rooms/invitations/accept.ts
deleted file mode 100644
index e69de29bb2..0000000000
diff --git a/packages/backend/src/server/api/endpoints/chat/rooms/invitations/create.ts b/packages/backend/src/server/api/endpoints/chat/rooms/invitations/create.ts
index e69de29bb2..6a1e3f0f73 100644
--- a/packages/backend/src/server/api/endpoints/chat/rooms/invitations/create.ts
+++ b/packages/backend/src/server/api/endpoints/chat/rooms/invitations/create.ts
@@ -0,0 +1,68 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { Inject, Injectable } from '@nestjs/common';
+import ms from 'ms';
+import { Endpoint } from '@/server/api/endpoint-base.js';
+import { DI } from '@/di-symbols.js';
+import { ApiError } from '@/server/api/error.js';
+import { ChatService } from '@/core/ChatService.js';
+import { ChatEntityService } from '@/core/entities/ChatEntityService.js';
+
+export const meta = {
+	tags: ['chat'],
+
+	requireCredential: true,
+	requiredRolePolicy: 'canChat',
+
+	prohibitMoved: true,
+
+	kind: 'write:chat',
+
+	limit: {
+		duration: ms('1day'),
+		max: 50,
+	},
+
+	res: {
+		type: 'object',
+		optional: false, nullable: false,
+		ref: 'ChatRoomInvitation',
+	},
+
+	errors: {
+		noSuchRoom: {
+			message: 'No such room.',
+			code: 'NO_SUCH_ROOM',
+			id: '916f9507-49ba-4e90-b57f-1fd4deaa47a5',
+		},
+	},
+} as const;
+
+export const paramDef = {
+	type: 'object',
+	properties: {
+		roomId: { type: 'string', format: 'misskey:id' },
+		userId: { type: 'string', format: 'misskey:id' },
+	},
+	required: ['roomId', 'userId'],
+} as const;
+
+@Injectable()
+export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
+	constructor(
+		private chatService: ChatService,
+		private chatEntityService: ChatEntityService,
+	) {
+		super(meta, paramDef, async (ps, me) => {
+			const room = await this.chatService.findMyRoomById(me.id, ps.roomId);
+			if (room == null) {
+				throw new ApiError(meta.errors.noSuchRoom);
+			}
+			const invitation = await this.chatService.createRoomInvitation(ps.userId, room.id, ps.userId);
+			return await this.chatEntityService.packRoomInvitation(invitation, me);
+		});
+	}
+}
diff --git a/packages/backend/src/server/api/endpoints/chat/rooms/invitations/delete.ts b/packages/backend/src/server/api/endpoints/chat/rooms/invitations/delete.ts
deleted file mode 100644
index e69de29bb2..0000000000
diff --git a/packages/backend/src/server/api/endpoints/chat/rooms/invitations/inbox.ts b/packages/backend/src/server/api/endpoints/chat/rooms/invitations/inbox.ts
index e69de29bb2..07337480fc 100644
--- a/packages/backend/src/server/api/endpoints/chat/rooms/invitations/inbox.ts
+++ b/packages/backend/src/server/api/endpoints/chat/rooms/invitations/inbox.ts
@@ -0,0 +1,54 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { Inject, Injectable } from '@nestjs/common';
+import { Endpoint } from '@/server/api/endpoint-base.js';
+import { DI } from '@/di-symbols.js';
+import { ChatService } from '@/core/ChatService.js';
+import { ChatEntityService } from '@/core/entities/ChatEntityService.js';
+import { ApiError } from '@/server/api/error.js';
+
+export const meta = {
+	tags: ['chat'],
+
+	requireCredential: true,
+
+	kind: 'read:chat',
+
+	res: {
+		type: 'array',
+		optional: false, nullable: false,
+		items: {
+			type: 'object',
+			optional: false, nullable: false,
+			ref: 'ChatRoomInvitation',
+		},
+	},
+
+	errors: {
+	},
+} as const;
+
+export const paramDef = {
+	type: 'object',
+	properties: {
+		limit: { type: 'integer', minimum: 1, maximum: 100, default: 30 },
+		sinceId: { type: 'string', format: 'misskey:id' },
+		untilId: { type: 'string', format: 'misskey:id' },
+	},
+} as const;
+
+@Injectable()
+export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
+	constructor(
+		private chatEntityService: ChatEntityService,
+		private chatService: ChatService,
+	) {
+		super(meta, paramDef, async (ps, me) => {
+			const invitations = await this.chatService.getReceivedRoomInvitationsWithPagination(me.id, ps.limit, ps.sinceId, ps.untilId);
+			return this.chatEntityService.packRoomInvitations(invitations, me);
+		});
+	}
+}
diff --git a/packages/backend/src/server/api/endpoints/chat/rooms/invitations/reject.ts b/packages/backend/src/server/api/endpoints/chat/rooms/invitations/reject.ts
index e69de29bb2..6a83ecc29a 100644
--- a/packages/backend/src/server/api/endpoints/chat/rooms/invitations/reject.ts
+++ b/packages/backend/src/server/api/endpoints/chat/rooms/invitations/reject.ts
@@ -0,0 +1,48 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { Inject, Injectable } from '@nestjs/common';
+import { Endpoint } from '@/server/api/endpoint-base.js';
+import { DI } from '@/di-symbols.js';
+import { ChatService } from '@/core/ChatService.js';
+import { ApiError } from '@/server/api/error.js';
+
+export const meta = {
+	tags: ['chat'],
+
+	requireCredential: true,
+
+	kind: 'write:chat',
+
+	res: {
+	},
+
+	errors: {
+		noSuchRoom: {
+			message: 'No such room.',
+			code: 'NO_SUCH_ROOM',
+			id: '5130557e-5a11-4cfb-9cc5-fe60cda5de0d',
+		},
+	},
+} as const;
+
+export const paramDef = {
+	type: 'object',
+	properties: {
+		roomId: { type: 'string', format: 'misskey:id' },
+	},
+	required: ['roomId'],
+} as const;
+
+@Injectable()
+export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
+	constructor(
+		private chatService: ChatService,
+	) {
+		super(meta, paramDef, async (ps, me) => {
+			await this.chatService.rejectRoomInvitation(me.id, ps.roomId);
+		});
+	}
+}
diff --git a/packages/backend/src/server/api/endpoints/chat/rooms/join.ts b/packages/backend/src/server/api/endpoints/chat/rooms/join.ts
new file mode 100644
index 0000000000..dbd4d1ea5a
--- /dev/null
+++ b/packages/backend/src/server/api/endpoints/chat/rooms/join.ts
@@ -0,0 +1,48 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { Inject, Injectable } from '@nestjs/common';
+import { Endpoint } from '@/server/api/endpoint-base.js';
+import { DI } from '@/di-symbols.js';
+import { ChatService } from '@/core/ChatService.js';
+import { ApiError } from '@/server/api/error.js';
+
+export const meta = {
+	tags: ['chat'],
+
+	requireCredential: true,
+
+	kind: 'write:chat',
+
+	res: {
+	},
+
+	errors: {
+		noSuchRoom: {
+			message: 'No such room.',
+			code: 'NO_SUCH_ROOM',
+			id: '84416476-5ce8-4a2c-b568-9569f1b10733',
+		},
+	},
+} as const;
+
+export const paramDef = {
+	type: 'object',
+	properties: {
+		roomId: { type: 'string', format: 'misskey:id' },
+	},
+	required: ['roomId'],
+} as const;
+
+@Injectable()
+export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
+	constructor(
+		private chatService: ChatService,
+	) {
+		super(meta, paramDef, async (ps, me) => {
+			await this.chatService.joinToRoom(me.id, ps.roomId);
+		});
+	}
+}
diff --git a/packages/backend/src/server/api/endpoints/chat/rooms/leave.ts b/packages/backend/src/server/api/endpoints/chat/rooms/leave.ts
new file mode 100644
index 0000000000..724ad61f7e
--- /dev/null
+++ b/packages/backend/src/server/api/endpoints/chat/rooms/leave.ts
@@ -0,0 +1,48 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { Inject, Injectable } from '@nestjs/common';
+import { Endpoint } from '@/server/api/endpoint-base.js';
+import { DI } from '@/di-symbols.js';
+import { ChatService } from '@/core/ChatService.js';
+import { ApiError } from '@/server/api/error.js';
+
+export const meta = {
+	tags: ['chat'],
+
+	requireCredential: true,
+
+	kind: 'write:chat',
+
+	res: {
+	},
+
+	errors: {
+		noSuchRoom: {
+			message: 'No such room.',
+			code: 'NO_SUCH_ROOM',
+			id: 'cb7f3179-50e8-4389-8c30-dbe2650a67c9',
+		},
+	},
+} as const;
+
+export const paramDef = {
+	type: 'object',
+	properties: {
+		roomId: { type: 'string', format: 'misskey:id' },
+	},
+	required: ['roomId'],
+} as const;
+
+@Injectable()
+export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
+	constructor(
+		private chatService: ChatService,
+	) {
+		super(meta, paramDef, async (ps, me) => {
+			await this.chatService.leaveRoom(me.id, ps.roomId);
+		});
+	}
+}
diff --git a/packages/backend/src/server/api/endpoints/chat/rooms/members.ts b/packages/backend/src/server/api/endpoints/chat/rooms/members.ts
new file mode 100644
index 0000000000..a895857aa9
--- /dev/null
+++ b/packages/backend/src/server/api/endpoints/chat/rooms/members.ts
@@ -0,0 +1,71 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { Inject, Injectable } from '@nestjs/common';
+import { Endpoint } from '@/server/api/endpoint-base.js';
+import { DI } from '@/di-symbols.js';
+import { ChatService } from '@/core/ChatService.js';
+import { ApiError } from '@/server/api/error.js';
+import { ChatEntityService } from '@/core/entities/ChatEntityService.js';
+
+export const meta = {
+	tags: ['chat'],
+
+	requireCredential: true,
+
+	kind: 'write:chat',
+
+	res: {
+		type: 'array',
+		optional: false, nullable: false,
+		items: {
+			type: 'object',
+			optional: false, nullable: false,
+			ref: 'ChatRoomMembership',
+		},
+	},
+
+	errors: {
+		noSuchRoom: {
+			message: 'No such room.',
+			code: 'NO_SUCH_ROOM',
+			id: '7b9fe84c-eafc-4d21-bf89-485458ed2c18',
+		},
+	},
+} as const;
+
+export const paramDef = {
+	type: 'object',
+	properties: {
+		roomId: { type: 'string', format: 'misskey:id' },
+		limit: { type: 'integer', minimum: 1, maximum: 100, default: 30 },
+		sinceId: { type: 'string', format: 'misskey:id' },
+		untilId: { type: 'string', format: 'misskey:id' },
+	},
+	required: ['roomId'],
+} as const;
+
+@Injectable()
+export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
+	constructor(
+		private chatService: ChatService,
+		private chatEntityService: ChatEntityService,
+	) {
+		super(meta, paramDef, async (ps, me) => {
+			const room = await this.chatService.findRoomById(ps.roomId);
+			if (room == null) {
+				throw new ApiError(meta.errors.noSuchRoom);
+			}
+
+			if (!(await this.chatService.isRoomMember(room.id, me.id)) && room.ownerId !== me.id) {
+				throw new ApiError(meta.errors.noSuchRoom);
+			}
+
+			const memberships = await this.chatService.getRoomMembershipsWithPagination(room.id, ps.limit, ps.sinceId, ps.untilId);
+
+			return this.chatEntityService.packRoomMemberships(memberships, me);
+		});
+	}
+}
diff --git a/packages/backend/src/server/api/endpoints/chat/rooms/owned.ts b/packages/backend/src/server/api/endpoints/chat/rooms/owned.ts
index e69de29bb2..6516120bca 100644
--- a/packages/backend/src/server/api/endpoints/chat/rooms/owned.ts
+++ b/packages/backend/src/server/api/endpoints/chat/rooms/owned.ts
@@ -0,0 +1,54 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { Inject, Injectable } from '@nestjs/common';
+import { Endpoint } from '@/server/api/endpoint-base.js';
+import { DI } from '@/di-symbols.js';
+import { ChatService } from '@/core/ChatService.js';
+import { ChatEntityService } from '@/core/entities/ChatEntityService.js';
+import { ApiError } from '@/server/api/error.js';
+
+export const meta = {
+	tags: ['chat'],
+
+	requireCredential: true,
+
+	kind: 'read:chat',
+
+	res: {
+		type: 'array',
+		optional: false, nullable: false,
+		items: {
+			type: 'object',
+			optional: false, nullable: false,
+			ref: 'ChatRoom',
+		},
+	},
+
+	errors: {
+	},
+} as const;
+
+export const paramDef = {
+	type: 'object',
+	properties: {
+		limit: { type: 'integer', minimum: 1, maximum: 100, default: 30 },
+		sinceId: { type: 'string', format: 'misskey:id' },
+		untilId: { type: 'string', format: 'misskey:id' },
+	},
+} as const;
+
+@Injectable()
+export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
+	constructor(
+		private chatEntityService: ChatEntityService,
+		private chatService: ChatService,
+	) {
+		super(meta, paramDef, async (ps, me) => {
+			const rooms = await this.chatService.getOwnedRoomsWithPagination(me.id, ps.limit, ps.sinceId, ps.untilId);
+			return this.chatEntityService.packRooms(rooms, me);
+		});
+	}
+}
diff --git a/packages/backend/src/server/api/endpoints/chat/rooms/show.ts b/packages/backend/src/server/api/endpoints/chat/rooms/show.ts
new file mode 100644
index 0000000000..547618ee7d
--- /dev/null
+++ b/packages/backend/src/server/api/endpoints/chat/rooms/show.ts
@@ -0,0 +1,58 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { Inject, Injectable } from '@nestjs/common';
+import { Endpoint } from '@/server/api/endpoint-base.js';
+import { DI } from '@/di-symbols.js';
+import { ChatService } from '@/core/ChatService.js';
+import { ApiError } from '@/server/api/error.js';
+import { ChatEntityService } from '@/core/entities/ChatEntityService.js';
+
+export const meta = {
+	tags: ['chat'],
+
+	requireCredential: true,
+
+	kind: 'read:chat',
+
+	res: {
+		type: 'object',
+		optional: false, nullable: false,
+		ref: 'ChatRoom',
+	},
+
+	errors: {
+		noSuchRoom: {
+			message: 'No such room.',
+			code: 'NO_SUCH_ROOM',
+			id: '857ae02f-8759-4d20-9adb-6e95fffe4fd7',
+		},
+	},
+} as const;
+
+export const paramDef = {
+	type: 'object',
+	properties: {
+		roomId: { type: 'string', format: 'misskey:id' },
+	},
+	required: ['roomId'],
+} as const;
+
+@Injectable()
+export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
+	constructor(
+		private chatService: ChatService,
+		private chatEntityService: ChatEntityService,
+	) {
+		super(meta, paramDef, async (ps, me) => {
+			const room = await this.chatService.findRoomById(ps.roomId);
+			if (room == null) {
+				throw new ApiError(meta.errors.noSuchRoom);
+			}
+
+			return this.chatEntityService.packRoom(room, me);
+		});
+	}
+}
diff --git a/packages/backend/src/server/api/endpoints/chat/rooms/update.ts b/packages/backend/src/server/api/endpoints/chat/rooms/update.ts
new file mode 100644
index 0000000000..60923fa253
--- /dev/null
+++ b/packages/backend/src/server/api/endpoints/chat/rooms/update.ts
@@ -0,0 +1,63 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { Inject, Injectable } from '@nestjs/common';
+import { Endpoint } from '@/server/api/endpoint-base.js';
+import { DI } from '@/di-symbols.js';
+import { ChatService } from '@/core/ChatService.js';
+import { ApiError } from '@/server/api/error.js';
+import { ChatEntityService } from '@/core/entities/ChatEntityService.js';
+
+export const meta = {
+	tags: ['chat'],
+
+	requireCredential: true,
+
+	kind: 'write:chat',
+
+	res: {
+		type: 'object',
+		optional: false, nullable: false,
+		ref: 'ChatRoom',
+	},
+
+	errors: {
+		noSuchRoom: {
+			message: 'No such room.',
+			code: 'NO_SUCH_ROOM',
+			id: 'fcdb0f92-bda6-47f9-bd05-343e0e020932',
+		},
+	},
+} as const;
+
+export const paramDef = {
+	type: 'object',
+	properties: {
+		roomId: { type: 'string', format: 'misskey:id' },
+		name: { type: 'string', maxLength: 256 },
+	},
+	required: ['roomId'],
+} as const;
+
+@Injectable()
+export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
+	constructor(
+		private chatService: ChatService,
+		private chatEntityService: ChatEntityService,
+	) {
+		super(meta, paramDef, async (ps, me) => {
+			const room = await this.chatService.findMyRoomById(me.id, ps.roomId);
+			if (room == null) {
+				throw new ApiError(meta.errors.noSuchRoom);
+			}
+
+			const updated = await this.chatService.updateRoom(room, {
+				name: ps.name,
+			});
+
+			return this.chatEntityService.packRoom(updated, me);
+		});
+	}
+}
diff --git a/packages/misskey-js/etc/misskey-js.api.md b/packages/misskey-js/etc/misskey-js.api.md
index dd1ac89ea3..cf675068cc 100644
--- a/packages/misskey-js/etc/misskey-js.api.md
+++ b/packages/misskey-js/etc/misskey-js.api.md
@@ -986,6 +986,78 @@ type ChatMessagesTimelineResponse = operations['chat___messages___timeline']['re
 // @public (undocumented)
 type ChatRoom = components['schemas']['ChatRoom'];
 
+// @public (undocumented)
+type ChatRoomInvitation = components['schemas']['ChatRoomInvitation'];
+
+// @public (undocumented)
+type ChatRoomMembership = components['schemas']['ChatRoomMembership'];
+
+// @public (undocumented)
+type ChatRoomsCreateRequest = operations['chat___rooms___create']['requestBody']['content']['application/json'];
+
+// @public (undocumented)
+type ChatRoomsCreateResponse = operations['chat___rooms___create']['responses']['200']['content']['application/json'];
+
+// @public (undocumented)
+type ChatRoomsDeleteRequest = operations['chat___rooms___delete']['requestBody']['content']['application/json'];
+
+// @public (undocumented)
+type ChatRoomsDeleteResponse = operations['chat___rooms___delete']['responses']['200']['content']['application/json'];
+
+// @public (undocumented)
+type ChatRoomsInvitationsCreateRequest = operations['chat___rooms___invitations___create']['requestBody']['content']['application/json'];
+
+// @public (undocumented)
+type ChatRoomsInvitationsCreateResponse = operations['chat___rooms___invitations___create']['responses']['200']['content']['application/json'];
+
+// @public (undocumented)
+type ChatRoomsInvitationsInboxRequest = operations['chat___rooms___invitations___inbox']['requestBody']['content']['application/json'];
+
+// @public (undocumented)
+type ChatRoomsInvitationsInboxResponse = operations['chat___rooms___invitations___inbox']['responses']['200']['content']['application/json'];
+
+// @public (undocumented)
+type ChatRoomsInvitationsRejectRequest = operations['chat___rooms___invitations___reject']['requestBody']['content']['application/json'];
+
+// @public (undocumented)
+type ChatRoomsInvitationsRejectResponse = operations['chat___rooms___invitations___reject']['responses']['200']['content']['application/json'];
+
+// @public (undocumented)
+type ChatRoomsJoinRequest = operations['chat___rooms___join']['requestBody']['content']['application/json'];
+
+// @public (undocumented)
+type ChatRoomsJoinResponse = operations['chat___rooms___join']['responses']['200']['content']['application/json'];
+
+// @public (undocumented)
+type ChatRoomsLeaveRequest = operations['chat___rooms___leave']['requestBody']['content']['application/json'];
+
+// @public (undocumented)
+type ChatRoomsLeaveResponse = operations['chat___rooms___leave']['responses']['200']['content']['application/json'];
+
+// @public (undocumented)
+type ChatRoomsMembersRequest = operations['chat___rooms___members']['requestBody']['content']['application/json'];
+
+// @public (undocumented)
+type ChatRoomsMembersResponse = operations['chat___rooms___members']['responses']['200']['content']['application/json'];
+
+// @public (undocumented)
+type ChatRoomsOwnedRequest = operations['chat___rooms___owned']['requestBody']['content']['application/json'];
+
+// @public (undocumented)
+type ChatRoomsOwnedResponse = operations['chat___rooms___owned']['responses']['200']['content']['application/json'];
+
+// @public (undocumented)
+type ChatRoomsShowRequest = operations['chat___rooms___show']['requestBody']['content']['application/json'];
+
+// @public (undocumented)
+type ChatRoomsShowResponse = operations['chat___rooms___show']['responses']['200']['content']['application/json'];
+
+// @public (undocumented)
+type ChatRoomsUpdateRequest = operations['chat___rooms___update']['requestBody']['content']['application/json'];
+
+// @public (undocumented)
+type ChatRoomsUpdateResponse = operations['chat___rooms___update']['responses']['200']['content']['application/json'];
+
 // @public (undocumented)
 type Clip = components['schemas']['Clip'];
 
@@ -1493,6 +1565,28 @@ declare namespace entities {
         ChatMessagesShowResponse,
         ChatMessagesTimelineRequest,
         ChatMessagesTimelineResponse,
+        ChatRoomsCreateRequest,
+        ChatRoomsCreateResponse,
+        ChatRoomsDeleteRequest,
+        ChatRoomsDeleteResponse,
+        ChatRoomsInvitationsCreateRequest,
+        ChatRoomsInvitationsCreateResponse,
+        ChatRoomsInvitationsInboxRequest,
+        ChatRoomsInvitationsInboxResponse,
+        ChatRoomsInvitationsRejectRequest,
+        ChatRoomsInvitationsRejectResponse,
+        ChatRoomsJoinRequest,
+        ChatRoomsJoinResponse,
+        ChatRoomsLeaveRequest,
+        ChatRoomsLeaveResponse,
+        ChatRoomsMembersRequest,
+        ChatRoomsMembersResponse,
+        ChatRoomsOwnedRequest,
+        ChatRoomsOwnedResponse,
+        ChatRoomsShowRequest,
+        ChatRoomsShowResponse,
+        ChatRoomsUpdateRequest,
+        ChatRoomsUpdateResponse,
         ClipsAddNoteRequest,
         ClipsCreateRequest,
         ClipsCreateResponse,
@@ -1928,7 +2022,9 @@ declare namespace entities {
         AbuseReportNotificationRecipient,
         ChatMessage,
         ChatMessageLite,
-        ChatRoom
+        ChatRoom,
+        ChatRoomInvitation,
+        ChatRoomMembership
     }
 }
 export { entities }
diff --git a/packages/misskey-js/src/autogen/apiClientJSDoc.ts b/packages/misskey-js/src/autogen/apiClientJSDoc.ts
index 7ee50678a3..23fc997d56 100644
--- a/packages/misskey-js/src/autogen/apiClientJSDoc.ts
+++ b/packages/misskey-js/src/autogen/apiClientJSDoc.ts
@@ -1589,6 +1589,127 @@ declare module '../api.js' {
       credential?: string | null,
     ): Promise<SwitchCaseResponseType<E, P>>;
 
+    /**
+     * No description provided.
+     * 
+     * **Credential required**: *Yes* / **Permission**: *write:chat*
+     */
+    request<E extends 'chat/rooms/create', P extends Endpoints[E]['req']>(
+      endpoint: E,
+      params: P,
+      credential?: string | null,
+    ): Promise<SwitchCaseResponseType<E, P>>;
+
+    /**
+     * No description provided.
+     * 
+     * **Credential required**: *Yes* / **Permission**: *write:chat*
+     */
+    request<E extends 'chat/rooms/delete', P extends Endpoints[E]['req']>(
+      endpoint: E,
+      params: P,
+      credential?: string | null,
+    ): Promise<SwitchCaseResponseType<E, P>>;
+
+    /**
+     * No description provided.
+     * 
+     * **Credential required**: *Yes* / **Permission**: *write:chat*
+     */
+    request<E extends 'chat/rooms/invitations/create', P extends Endpoints[E]['req']>(
+      endpoint: E,
+      params: P,
+      credential?: string | null,
+    ): Promise<SwitchCaseResponseType<E, P>>;
+
+    /**
+     * No description provided.
+     * 
+     * **Credential required**: *Yes* / **Permission**: *read:chat*
+     */
+    request<E extends 'chat/rooms/invitations/inbox', P extends Endpoints[E]['req']>(
+      endpoint: E,
+      params: P,
+      credential?: string | null,
+    ): Promise<SwitchCaseResponseType<E, P>>;
+
+    /**
+     * No description provided.
+     * 
+     * **Credential required**: *Yes* / **Permission**: *write:chat*
+     */
+    request<E extends 'chat/rooms/invitations/reject', P extends Endpoints[E]['req']>(
+      endpoint: E,
+      params: P,
+      credential?: string | null,
+    ): Promise<SwitchCaseResponseType<E, P>>;
+
+    /**
+     * No description provided.
+     * 
+     * **Credential required**: *Yes* / **Permission**: *write:chat*
+     */
+    request<E extends 'chat/rooms/join', P extends Endpoints[E]['req']>(
+      endpoint: E,
+      params: P,
+      credential?: string | null,
+    ): Promise<SwitchCaseResponseType<E, P>>;
+
+    /**
+     * No description provided.
+     * 
+     * **Credential required**: *Yes* / **Permission**: *write:chat*
+     */
+    request<E extends 'chat/rooms/leave', P extends Endpoints[E]['req']>(
+      endpoint: E,
+      params: P,
+      credential?: string | null,
+    ): Promise<SwitchCaseResponseType<E, P>>;
+
+    /**
+     * No description provided.
+     * 
+     * **Credential required**: *Yes* / **Permission**: *write:chat*
+     */
+    request<E extends 'chat/rooms/members', P extends Endpoints[E]['req']>(
+      endpoint: E,
+      params: P,
+      credential?: string | null,
+    ): Promise<SwitchCaseResponseType<E, P>>;
+
+    /**
+     * No description provided.
+     * 
+     * **Credential required**: *Yes* / **Permission**: *read:chat*
+     */
+    request<E extends 'chat/rooms/owned', P extends Endpoints[E]['req']>(
+      endpoint: E,
+      params: P,
+      credential?: string | null,
+    ): Promise<SwitchCaseResponseType<E, P>>;
+
+    /**
+     * No description provided.
+     * 
+     * **Credential required**: *Yes* / **Permission**: *read:chat*
+     */
+    request<E extends 'chat/rooms/show', P extends Endpoints[E]['req']>(
+      endpoint: E,
+      params: P,
+      credential?: string | null,
+    ): Promise<SwitchCaseResponseType<E, P>>;
+
+    /**
+     * No description provided.
+     * 
+     * **Credential required**: *Yes* / **Permission**: *write:chat*
+     */
+    request<E extends 'chat/rooms/update', P extends Endpoints[E]['req']>(
+      endpoint: E,
+      params: P,
+      credential?: string | null,
+    ): Promise<SwitchCaseResponseType<E, P>>;
+
     /**
      * No description provided.
      * 
diff --git a/packages/misskey-js/src/autogen/endpoint.ts b/packages/misskey-js/src/autogen/endpoint.ts
index 74887f5587..ff48e101bc 100644
--- a/packages/misskey-js/src/autogen/endpoint.ts
+++ b/packages/misskey-js/src/autogen/endpoint.ts
@@ -217,6 +217,28 @@ import type {
 	ChatMessagesShowResponse,
 	ChatMessagesTimelineRequest,
 	ChatMessagesTimelineResponse,
+	ChatRoomsCreateRequest,
+	ChatRoomsCreateResponse,
+	ChatRoomsDeleteRequest,
+	ChatRoomsDeleteResponse,
+	ChatRoomsInvitationsCreateRequest,
+	ChatRoomsInvitationsCreateResponse,
+	ChatRoomsInvitationsInboxRequest,
+	ChatRoomsInvitationsInboxResponse,
+	ChatRoomsInvitationsRejectRequest,
+	ChatRoomsInvitationsRejectResponse,
+	ChatRoomsJoinRequest,
+	ChatRoomsJoinResponse,
+	ChatRoomsLeaveRequest,
+	ChatRoomsLeaveResponse,
+	ChatRoomsMembersRequest,
+	ChatRoomsMembersResponse,
+	ChatRoomsOwnedRequest,
+	ChatRoomsOwnedResponse,
+	ChatRoomsShowRequest,
+	ChatRoomsShowResponse,
+	ChatRoomsUpdateRequest,
+	ChatRoomsUpdateResponse,
 	ClipsAddNoteRequest,
 	ClipsCreateRequest,
 	ClipsCreateResponse,
@@ -741,6 +763,17 @@ export type Endpoints = {
 	'chat/messages/delete': { req: ChatMessagesDeleteRequest; res: ChatMessagesDeleteResponse };
 	'chat/messages/show': { req: ChatMessagesShowRequest; res: ChatMessagesShowResponse };
 	'chat/messages/timeline': { req: ChatMessagesTimelineRequest; res: ChatMessagesTimelineResponse };
+	'chat/rooms/create': { req: ChatRoomsCreateRequest; res: ChatRoomsCreateResponse };
+	'chat/rooms/delete': { req: ChatRoomsDeleteRequest; res: ChatRoomsDeleteResponse };
+	'chat/rooms/invitations/create': { req: ChatRoomsInvitationsCreateRequest; res: ChatRoomsInvitationsCreateResponse };
+	'chat/rooms/invitations/inbox': { req: ChatRoomsInvitationsInboxRequest; res: ChatRoomsInvitationsInboxResponse };
+	'chat/rooms/invitations/reject': { req: ChatRoomsInvitationsRejectRequest; res: ChatRoomsInvitationsRejectResponse };
+	'chat/rooms/join': { req: ChatRoomsJoinRequest; res: ChatRoomsJoinResponse };
+	'chat/rooms/leave': { req: ChatRoomsLeaveRequest; res: ChatRoomsLeaveResponse };
+	'chat/rooms/members': { req: ChatRoomsMembersRequest; res: ChatRoomsMembersResponse };
+	'chat/rooms/owned': { req: ChatRoomsOwnedRequest; res: ChatRoomsOwnedResponse };
+	'chat/rooms/show': { req: ChatRoomsShowRequest; res: ChatRoomsShowResponse };
+	'chat/rooms/update': { req: ChatRoomsUpdateRequest; res: ChatRoomsUpdateResponse };
 	'clips/add-note': { req: ClipsAddNoteRequest; res: EmptyResponse };
 	'clips/create': { req: ClipsCreateRequest; res: ClipsCreateResponse };
 	'clips/delete': { req: ClipsDeleteRequest; res: EmptyResponse };
diff --git a/packages/misskey-js/src/autogen/entities.ts b/packages/misskey-js/src/autogen/entities.ts
index a1c3a7ffb3..7ee482365f 100644
--- a/packages/misskey-js/src/autogen/entities.ts
+++ b/packages/misskey-js/src/autogen/entities.ts
@@ -220,6 +220,28 @@ export type ChatMessagesShowRequest = operations['chat___messages___show']['requ
 export type ChatMessagesShowResponse = operations['chat___messages___show']['responses']['200']['content']['application/json'];
 export type ChatMessagesTimelineRequest = operations['chat___messages___timeline']['requestBody']['content']['application/json'];
 export type ChatMessagesTimelineResponse = operations['chat___messages___timeline']['responses']['200']['content']['application/json'];
+export type ChatRoomsCreateRequest = operations['chat___rooms___create']['requestBody']['content']['application/json'];
+export type ChatRoomsCreateResponse = operations['chat___rooms___create']['responses']['200']['content']['application/json'];
+export type ChatRoomsDeleteRequest = operations['chat___rooms___delete']['requestBody']['content']['application/json'];
+export type ChatRoomsDeleteResponse = operations['chat___rooms___delete']['responses']['200']['content']['application/json'];
+export type ChatRoomsInvitationsCreateRequest = operations['chat___rooms___invitations___create']['requestBody']['content']['application/json'];
+export type ChatRoomsInvitationsCreateResponse = operations['chat___rooms___invitations___create']['responses']['200']['content']['application/json'];
+export type ChatRoomsInvitationsInboxRequest = operations['chat___rooms___invitations___inbox']['requestBody']['content']['application/json'];
+export type ChatRoomsInvitationsInboxResponse = operations['chat___rooms___invitations___inbox']['responses']['200']['content']['application/json'];
+export type ChatRoomsInvitationsRejectRequest = operations['chat___rooms___invitations___reject']['requestBody']['content']['application/json'];
+export type ChatRoomsInvitationsRejectResponse = operations['chat___rooms___invitations___reject']['responses']['200']['content']['application/json'];
+export type ChatRoomsJoinRequest = operations['chat___rooms___join']['requestBody']['content']['application/json'];
+export type ChatRoomsJoinResponse = operations['chat___rooms___join']['responses']['200']['content']['application/json'];
+export type ChatRoomsLeaveRequest = operations['chat___rooms___leave']['requestBody']['content']['application/json'];
+export type ChatRoomsLeaveResponse = operations['chat___rooms___leave']['responses']['200']['content']['application/json'];
+export type ChatRoomsMembersRequest = operations['chat___rooms___members']['requestBody']['content']['application/json'];
+export type ChatRoomsMembersResponse = operations['chat___rooms___members']['responses']['200']['content']['application/json'];
+export type ChatRoomsOwnedRequest = operations['chat___rooms___owned']['requestBody']['content']['application/json'];
+export type ChatRoomsOwnedResponse = operations['chat___rooms___owned']['responses']['200']['content']['application/json'];
+export type ChatRoomsShowRequest = operations['chat___rooms___show']['requestBody']['content']['application/json'];
+export type ChatRoomsShowResponse = operations['chat___rooms___show']['responses']['200']['content']['application/json'];
+export type ChatRoomsUpdateRequest = operations['chat___rooms___update']['requestBody']['content']['application/json'];
+export type ChatRoomsUpdateResponse = operations['chat___rooms___update']['responses']['200']['content']['application/json'];
 export type ClipsAddNoteRequest = operations['clips___add-note']['requestBody']['content']['application/json'];
 export type ClipsCreateRequest = operations['clips___create']['requestBody']['content']['application/json'];
 export type ClipsCreateResponse = operations['clips___create']['responses']['200']['content']['application/json'];
diff --git a/packages/misskey-js/src/autogen/models.ts b/packages/misskey-js/src/autogen/models.ts
index ca65b9e139..0ff9749602 100644
--- a/packages/misskey-js/src/autogen/models.ts
+++ b/packages/misskey-js/src/autogen/models.ts
@@ -57,3 +57,5 @@ export type AbuseReportNotificationRecipient = components['schemas']['AbuseRepor
 export type ChatMessage = components['schemas']['ChatMessage'];
 export type ChatMessageLite = components['schemas']['ChatMessageLite'];
 export type ChatRoom = components['schemas']['ChatRoom'];
+export type ChatRoomInvitation = components['schemas']['ChatRoomInvitation'];
+export type ChatRoomMembership = components['schemas']['ChatRoomMembership'];
diff --git a/packages/misskey-js/src/autogen/types.ts b/packages/misskey-js/src/autogen/types.ts
index eaec05eca8..362f7907cb 100644
--- a/packages/misskey-js/src/autogen/types.ts
+++ b/packages/misskey-js/src/autogen/types.ts
@@ -1403,6 +1403,105 @@ export type paths = {
      */
     post: operations['chat___messages___timeline'];
   };
+  '/chat/rooms/create': {
+    /**
+     * chat/rooms/create
+     * @description No description provided.
+     *
+     * **Credential required**: *Yes* / **Permission**: *write:chat*
+     */
+    post: operations['chat___rooms___create'];
+  };
+  '/chat/rooms/delete': {
+    /**
+     * chat/rooms/delete
+     * @description No description provided.
+     *
+     * **Credential required**: *Yes* / **Permission**: *write:chat*
+     */
+    post: operations['chat___rooms___delete'];
+  };
+  '/chat/rooms/invitations/create': {
+    /**
+     * chat/rooms/invitations/create
+     * @description No description provided.
+     *
+     * **Credential required**: *Yes* / **Permission**: *write:chat*
+     */
+    post: operations['chat___rooms___invitations___create'];
+  };
+  '/chat/rooms/invitations/inbox': {
+    /**
+     * chat/rooms/invitations/inbox
+     * @description No description provided.
+     *
+     * **Credential required**: *Yes* / **Permission**: *read:chat*
+     */
+    post: operations['chat___rooms___invitations___inbox'];
+  };
+  '/chat/rooms/invitations/reject': {
+    /**
+     * chat/rooms/invitations/reject
+     * @description No description provided.
+     *
+     * **Credential required**: *Yes* / **Permission**: *write:chat*
+     */
+    post: operations['chat___rooms___invitations___reject'];
+  };
+  '/chat/rooms/join': {
+    /**
+     * chat/rooms/join
+     * @description No description provided.
+     *
+     * **Credential required**: *Yes* / **Permission**: *write:chat*
+     */
+    post: operations['chat___rooms___join'];
+  };
+  '/chat/rooms/leave': {
+    /**
+     * chat/rooms/leave
+     * @description No description provided.
+     *
+     * **Credential required**: *Yes* / **Permission**: *write:chat*
+     */
+    post: operations['chat___rooms___leave'];
+  };
+  '/chat/rooms/members': {
+    /**
+     * chat/rooms/members
+     * @description No description provided.
+     *
+     * **Credential required**: *Yes* / **Permission**: *write:chat*
+     */
+    post: operations['chat___rooms___members'];
+  };
+  '/chat/rooms/owned': {
+    /**
+     * chat/rooms/owned
+     * @description No description provided.
+     *
+     * **Credential required**: *Yes* / **Permission**: *read:chat*
+     */
+    post: operations['chat___rooms___owned'];
+  };
+  '/chat/rooms/show': {
+    /**
+     * chat/rooms/show
+     * @description No description provided.
+     *
+     * **Credential required**: *Yes* / **Permission**: *read:chat*
+     */
+    post: operations['chat___rooms___show'];
+  };
+  '/chat/rooms/update': {
+    /**
+     * chat/rooms/update
+     * @description No description provided.
+     *
+     * **Credential required**: *Yes* / **Permission**: *write:chat*
+     */
+    post: operations['chat___rooms___update'];
+  };
   '/clips/add-note': {
     /**
      * clips/add-note
@@ -5220,6 +5319,22 @@ export type components = {
       owner: components['schemas']['UserLite'];
       name: string;
     };
+    ChatRoomInvitation: {
+      id: string;
+      /** Format: date-time */
+      createdAt: string;
+      userId: string;
+      user: components['schemas']['UserLite'];
+      roomId: string;
+      room: components['schemas']['ChatRoom'];
+    };
+    ChatRoomMembership: {
+      id: string;
+      /** Format: date-time */
+      createdAt: string;
+      userId: string;
+      user: components['schemas']['UserLite'];
+    };
   };
   responses: never;
   parameters: never;
@@ -14030,6 +14145,628 @@ export type operations = {
       };
     };
   };
+  /**
+   * chat/rooms/create
+   * @description No description provided.
+   *
+   * **Credential required**: *Yes* / **Permission**: *write:chat*
+   */
+  chat___rooms___create: {
+    requestBody: {
+      content: {
+        'application/json': {
+          name: string;
+        };
+      };
+    };
+    responses: {
+      /** @description OK (with results) */
+      200: {
+        content: {
+          'application/json': components['schemas']['ChatRoom'];
+        };
+      };
+      /** @description Client error */
+      400: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Authentication error */
+      401: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Forbidden error */
+      403: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description I'm Ai */
+      418: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Too many requests */
+      429: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Internal server error */
+      500: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+    };
+  };
+  /**
+   * chat/rooms/delete
+   * @description No description provided.
+   *
+   * **Credential required**: *Yes* / **Permission**: *write:chat*
+   */
+  chat___rooms___delete: {
+    requestBody: {
+      content: {
+        'application/json': {
+          /** Format: misskey:id */
+          roomId: string;
+        };
+      };
+    };
+    responses: {
+      /** @description OK (with results) */
+      200: {
+        content: {
+          'application/json': unknown;
+        };
+      };
+      /** @description Client error */
+      400: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Authentication error */
+      401: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Forbidden error */
+      403: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description I'm Ai */
+      418: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Internal server error */
+      500: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+    };
+  };
+  /**
+   * chat/rooms/invitations/create
+   * @description No description provided.
+   *
+   * **Credential required**: *Yes* / **Permission**: *write:chat*
+   */
+  chat___rooms___invitations___create: {
+    requestBody: {
+      content: {
+        'application/json': {
+          /** Format: misskey:id */
+          roomId: string;
+          /** Format: misskey:id */
+          userId: string;
+        };
+      };
+    };
+    responses: {
+      /** @description OK (with results) */
+      200: {
+        content: {
+          'application/json': components['schemas']['ChatRoomInvitation'];
+        };
+      };
+      /** @description Client error */
+      400: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Authentication error */
+      401: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Forbidden error */
+      403: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description I'm Ai */
+      418: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Too many requests */
+      429: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Internal server error */
+      500: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+    };
+  };
+  /**
+   * chat/rooms/invitations/inbox
+   * @description No description provided.
+   *
+   * **Credential required**: *Yes* / **Permission**: *read:chat*
+   */
+  chat___rooms___invitations___inbox: {
+    requestBody: {
+      content: {
+        'application/json': {
+          /** @default 30 */
+          limit?: number;
+          /** Format: misskey:id */
+          sinceId?: string;
+          /** Format: misskey:id */
+          untilId?: string;
+        };
+      };
+    };
+    responses: {
+      /** @description OK (with results) */
+      200: {
+        content: {
+          'application/json': components['schemas']['ChatRoomInvitation'][];
+        };
+      };
+      /** @description Client error */
+      400: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Authentication error */
+      401: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Forbidden error */
+      403: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description I'm Ai */
+      418: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Internal server error */
+      500: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+    };
+  };
+  /**
+   * chat/rooms/invitations/reject
+   * @description No description provided.
+   *
+   * **Credential required**: *Yes* / **Permission**: *write:chat*
+   */
+  chat___rooms___invitations___reject: {
+    requestBody: {
+      content: {
+        'application/json': {
+          /** Format: misskey:id */
+          roomId: string;
+        };
+      };
+    };
+    responses: {
+      /** @description OK (with results) */
+      200: {
+        content: {
+          'application/json': unknown;
+        };
+      };
+      /** @description Client error */
+      400: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Authentication error */
+      401: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Forbidden error */
+      403: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description I'm Ai */
+      418: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Internal server error */
+      500: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+    };
+  };
+  /**
+   * chat/rooms/join
+   * @description No description provided.
+   *
+   * **Credential required**: *Yes* / **Permission**: *write:chat*
+   */
+  chat___rooms___join: {
+    requestBody: {
+      content: {
+        'application/json': {
+          /** Format: misskey:id */
+          roomId: string;
+        };
+      };
+    };
+    responses: {
+      /** @description OK (with results) */
+      200: {
+        content: {
+          'application/json': unknown;
+        };
+      };
+      /** @description Client error */
+      400: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Authentication error */
+      401: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Forbidden error */
+      403: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description I'm Ai */
+      418: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Internal server error */
+      500: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+    };
+  };
+  /**
+   * chat/rooms/leave
+   * @description No description provided.
+   *
+   * **Credential required**: *Yes* / **Permission**: *write:chat*
+   */
+  chat___rooms___leave: {
+    requestBody: {
+      content: {
+        'application/json': {
+          /** Format: misskey:id */
+          roomId: string;
+        };
+      };
+    };
+    responses: {
+      /** @description OK (with results) */
+      200: {
+        content: {
+          'application/json': unknown;
+        };
+      };
+      /** @description Client error */
+      400: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Authentication error */
+      401: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Forbidden error */
+      403: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description I'm Ai */
+      418: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Internal server error */
+      500: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+    };
+  };
+  /**
+   * chat/rooms/members
+   * @description No description provided.
+   *
+   * **Credential required**: *Yes* / **Permission**: *write:chat*
+   */
+  chat___rooms___members: {
+    requestBody: {
+      content: {
+        'application/json': {
+          /** Format: misskey:id */
+          roomId: string;
+          /** @default 30 */
+          limit?: number;
+          /** Format: misskey:id */
+          sinceId?: string;
+          /** Format: misskey:id */
+          untilId?: string;
+        };
+      };
+    };
+    responses: {
+      /** @description OK (with results) */
+      200: {
+        content: {
+          'application/json': components['schemas']['ChatRoomMembership'][];
+        };
+      };
+      /** @description Client error */
+      400: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Authentication error */
+      401: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Forbidden error */
+      403: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description I'm Ai */
+      418: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Internal server error */
+      500: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+    };
+  };
+  /**
+   * chat/rooms/owned
+   * @description No description provided.
+   *
+   * **Credential required**: *Yes* / **Permission**: *read:chat*
+   */
+  chat___rooms___owned: {
+    requestBody: {
+      content: {
+        'application/json': {
+          /** @default 30 */
+          limit?: number;
+          /** Format: misskey:id */
+          sinceId?: string;
+          /** Format: misskey:id */
+          untilId?: string;
+        };
+      };
+    };
+    responses: {
+      /** @description OK (with results) */
+      200: {
+        content: {
+          'application/json': components['schemas']['ChatRoom'][];
+        };
+      };
+      /** @description Client error */
+      400: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Authentication error */
+      401: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Forbidden error */
+      403: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description I'm Ai */
+      418: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Internal server error */
+      500: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+    };
+  };
+  /**
+   * chat/rooms/show
+   * @description No description provided.
+   *
+   * **Credential required**: *Yes* / **Permission**: *read:chat*
+   */
+  chat___rooms___show: {
+    requestBody: {
+      content: {
+        'application/json': {
+          /** Format: misskey:id */
+          roomId: string;
+        };
+      };
+    };
+    responses: {
+      /** @description OK (with results) */
+      200: {
+        content: {
+          'application/json': components['schemas']['ChatRoom'];
+        };
+      };
+      /** @description Client error */
+      400: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Authentication error */
+      401: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Forbidden error */
+      403: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description I'm Ai */
+      418: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Internal server error */
+      500: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+    };
+  };
+  /**
+   * chat/rooms/update
+   * @description No description provided.
+   *
+   * **Credential required**: *Yes* / **Permission**: *write:chat*
+   */
+  chat___rooms___update: {
+    requestBody: {
+      content: {
+        'application/json': {
+          /** Format: misskey:id */
+          roomId: string;
+          name?: string;
+        };
+      };
+    };
+    responses: {
+      /** @description OK (with results) */
+      200: {
+        content: {
+          'application/json': components['schemas']['ChatRoom'];
+        };
+      };
+      /** @description Client error */
+      400: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Authentication error */
+      401: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Forbidden error */
+      403: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description I'm Ai */
+      418: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+      /** @description Internal server error */
+      500: {
+        content: {
+          'application/json': components['schemas']['Error'];
+        };
+      };
+    };
+  };
   /**
    * clips/add-note
    * @description No description provided.