diff --git a/packages/backend/src/server/api/endpoints/renote-mute/create.ts b/packages/backend/src/server/api/endpoints/renote-mute/create.ts
index 7ff7b5de3a..2d853b94f3 100644
--- a/packages/backend/src/server/api/endpoints/renote-mute/create.ts
+++ b/packages/backend/src/server/api/endpoints/renote-mute/create.ts
@@ -73,7 +73,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 			}
 
 			// Get mutee
-			const mutee = await getterService.getUser(ps.userId).catch(err => {
+			const mutee = await this.getterService.getUser(ps.userId).catch(err => {
 				if (err.id === '15348ddd-432d-49c2-8a5a-8069753becff') throw new ApiError(meta.errors.noSuchUser);
 				throw err;
 			});
diff --git a/packages/backend/src/server/api/endpoints/reversi/match.ts b/packages/backend/src/server/api/endpoints/reversi/match.ts
new file mode 100644
index 0000000000..86d3ad6da4
--- /dev/null
+++ b/packages/backend/src/server/api/endpoints/reversi/match.ts
@@ -0,0 +1,119 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and other misskey contributors
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+import { Inject, Injectable } from '@nestjs/common';
+import { Endpoint } from '@/server/api/endpoint-base.js';
+import { IdService } from '@/core/IdService.js';
+import type { ReversiGamesRepository, ReversiMatchingsRepository } from '@/models/_.js';
+import { DI } from '@/di-symbols.js';
+import { ApiError } from '../../error.js';
+import { GetterService } from '../../GetterService.js';
+
+export const meta = {
+	requireCredential: true,
+
+	kind: 'write:account',
+
+	errors: {
+		noSuchUser: {
+			message: 'No such user.',
+			code: 'NO_SUCH_USER',
+			id: '0b4f0559-b484-4e31-9581-3f73cee89b28',
+		},
+
+		isYourself: {
+			message: 'Target user is yourself.',
+			code: 'TARGET_IS_YOURSELF',
+			id: '96fd7bd6-d2bc-426c-a865-d055dcd2828e',
+		},
+	},
+
+	res: {
+	},
+} as const;
+
+export const paramDef = {
+	type: 'object',
+	properties: {
+		userId: { type: 'string', format: 'misskey:id' },
+	},
+	required: ['userId'],
+} as const;
+
+@Injectable()
+export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-disable-line import/no-default-export
+	constructor(
+		@Inject(DI.reversiGamesRepository)
+		private reversiGamesRepository: ReversiGamesRepository,
+
+		@Inject(DI.reversiMatchingsRepository)
+		private reversiMatchingsRepository: ReversiMatchingsRepository,
+
+		private getterService: GetterService,
+		private idService: IdService,
+	) {
+		super(meta, paramDef, async (ps, me) => {
+			if (ps.userId === me.id) {
+				throw new ApiError(meta.errors.isYourself);
+			}
+
+			const exist = await this.reversiMatchingsRepository.findOneBy({
+				parentId: ps.userId,
+				childId: me.id,
+			});
+
+			if (exist) {
+				this.reversiMatchingsRepository.delete(exist.id);
+
+				const game = await this.reversiGamesRepository.insert({
+					id: this.idService.gen(),
+					user1Id: exist.parentId,
+					user2Id: me.id,
+					user1Accepted: false,
+					user2Accepted: false,
+					isStarted: false,
+					isEnded: false,
+					logs: [],
+					map: eighteight.data,
+					bw: 'random',
+					isLlotheo: false,
+				});
+
+				publishReversiStream(exist.parentId, 'matched', await ReversiGames.pack(game, { id: exist.parentId }));
+
+				const other = await this.reversiMatchingsRepository.countBy({
+					childId: me.id,
+				});
+
+				if (other == 0) {
+					publishMainStream(me.id, 'reversiNoInvites');
+				}
+
+				return await ReversiGames.pack(game, me);
+			} else {
+				const child = await this.getterService.getUser(ps.userId).catch(err => {
+					if (err.id === '15348ddd-432d-49c2-8a5a-8069753becff') throw new ApiError(meta.errors.noSuchUser);
+					throw err;
+				});
+
+				await this.reversiMatchingsRepository.delete({
+					parentId: me.id,
+				});
+
+				const matching = await this.reversiMatchingsRepository.insert({
+					id: this.idService.gen(),
+					parentId: me.id,
+					childId: child.id,
+				});
+
+				const packed = await ReversiMatchings.pack(matching, child);
+				publishReversiStream(child.id, 'invited', packed);
+				publishMainStream(child.id, 'reversiInvited', packed);
+
+				return;
+			}
+		});
+	}
+}