diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6b9ae480af..329e867244 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,7 +1,7 @@
 ## 2024.11.1
 
 ### General
--
+- Enhance: リアクションの一覧の公開設定が連合されるように
 
 ### Client
 - Fix: 画面サイズが変わった際にナビゲーションバーが自動で折りたたまれない問題を修正
diff --git a/packages/backend/migration/1723208290742-remote-public-reactions-set-false.js b/packages/backend/migration/1723208290742-remote-public-reactions-set-false.js
new file mode 100644
index 0000000000..f6114bcbe0
--- /dev/null
+++ b/packages/backend/migration/1723208290742-remote-public-reactions-set-false.js
@@ -0,0 +1,16 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+export class RemotePublicReactionsSetFalse1723208290742 {
+    name = 'RemotePublicReactionsSetFalse1723208290742'
+
+    async up(queryRunner) {
+        await queryRunner.query(`UPDATE "user_profile" SET "publicReactions" = FALSE WHERE "userHost" IS NOT NULL`);
+    }
+
+    async down(queryRunner) {
+        // no valid down migration
+    }
+}
diff --git a/packages/backend/src/core/activitypub/ApRendererService.ts b/packages/backend/src/core/activitypub/ApRendererService.ts
index 5617a29bab..b5d6bd3a2a 100644
--- a/packages/backend/src/core/activitypub/ApRendererService.ts
+++ b/packages/backend/src/core/activitypub/ApRendererService.ts
@@ -472,6 +472,13 @@ export class ApRendererService {
 
 		const hashtagTags = user.tags.map(tag => this.renderHashtag(tag));
 
+		const likedId = `${id}/liked`;
+		const liked = this.renderOrderedCollection(
+			likedId,
+			undefined,
+			profile.publicReactions ? `${likedId}?page=true` : undefined,
+		);
+
 		const tag = [
 			...apemojis,
 			...hashtagTags,
@@ -486,6 +493,7 @@ export class ApRendererService {
 			outbox: `${id}/outbox`,
 			followers: `${id}/followers`,
 			following: `${id}/following`,
+			liked,
 			featured: `${id}/collections/featured`,
 			sharedInbox: `${this.config.url}/inbox`,
 			endpoints: { sharedInbox: `${this.config.url}/inbox` },
@@ -670,7 +678,7 @@ export class ApRendererService {
 	 * @param orderedItems attached objects (optional)
 	 */
 	@bindThis
-	public renderOrderedCollection(id: string, totalItems: number, first?: string, last?: string, orderedItems?: IObject[]) {
+	public renderOrderedCollection(id: string, totalItems?: number, first?: string, last?: string, orderedItems?: IObject[]) {
 		const page: any = {
 			id,
 			type: 'OrderedCollection',
diff --git a/packages/backend/src/core/activitypub/models/ApPersonService.ts b/packages/backend/src/core/activitypub/models/ApPersonService.ts
index 8590861ca0..f0dc7ab643 100644
--- a/packages/backend/src/core/activitypub/models/ApPersonService.ts
+++ b/packages/backend/src/core/activitypub/models/ApPersonService.ts
@@ -321,17 +321,17 @@ export class ApPersonService implements OnModuleInit {
 
 		const isBot = getApType(object) === 'Service' || getApType(object) === 'Application';
 
-		const [followingVisibility, followersVisibility] = await Promise.all(
+		const [publicReactions, followingIsPublic, followersIsPublic] = await Promise.all(
 			[
+				this.isPublicCollection(person.liked, resolver),
 				this.isPublicCollection(person.following, resolver),
 				this.isPublicCollection(person.followers, resolver),
-			].map((p): Promise<'public' | 'private'> => p
-				.then(isPublic => isPublic ? 'public' : 'private')
+			].map((p): Promise<boolean> => p
 				.catch(err => {
 					if (!(err instanceof StatusError) || err.isRetryable) {
-						this.logger.error('error occurred while fetching following/followers collection', { stack: err });
+						this.logger.error('error occurred while fetching actor collection', { stack: err });
 					}
-					return 'private';
+					return false;
 				}),
 			),
 		);
@@ -411,8 +411,9 @@ export class ApPersonService implements OnModuleInit {
 					followedMessage: person._misskey_followedMessage != null ? truncate(person._misskey_followedMessage, 256) : null,
 					url,
 					fields,
-					followingVisibility,
-					followersVisibility,
+					publicReactions,
+					followingVisibility: followingIsPublic ? 'public' : 'private',
+					followersVisibility: followersIsPublic ? 'public' : 'private',
 					birthday: bday?.[0] ?? null,
 					location: person['vcard:Address'] ?? null,
 					userHost: host,
@@ -522,19 +523,19 @@ export class ApPersonService implements OnModuleInit {
 
 		const tags = extractApHashtags(person.tag).map(normalizeForSearch).splice(0, 32);
 
-		const [followingVisibility, followersVisibility] = await Promise.all(
+		const [publicReactions, followingIsPublic, followersIsPublic] = await Promise.all(
 			[
+				this.isPublicCollection(person.liked, resolver),
 				this.isPublicCollection(person.following, resolver),
 				this.isPublicCollection(person.followers, resolver),
-			].map((p): Promise<'public' | 'private' | undefined> => p
-				.then(isPublic => isPublic ? 'public' : 'private')
+			].map((p): Promise<boolean | undefined> => p
 				.catch(err => {
 					if (!(err instanceof StatusError) || err.isRetryable) {
-						this.logger.error('error occurred while fetching following/followers collection', { stack: err });
+						this.logger.error('error occurred while fetching actor collection', { stack: err });
 						// Do not update the visibiility on transient errors.
 						return undefined;
 					}
-					return 'private';
+					return false;
 				}),
 			),
 		);
@@ -618,8 +619,9 @@ export class ApPersonService implements OnModuleInit {
 			fields,
 			description: _description,
 			followedMessage: person._misskey_followedMessage != null ? truncate(person._misskey_followedMessage, 256) : null,
-			followingVisibility,
-			followersVisibility,
+			publicReactions,
+			followingVisibility: followingIsPublic ? 'public' : followingIsPublic === false ? 'private' : undefined,
+			followersVisibility: followersIsPublic ? 'public' : followersIsPublic === false ? 'private' : undefined,
 			birthday: bday?.[0] ?? null,
 			location: person['vcard:Address'] ?? null,
 		});
diff --git a/packages/backend/src/core/activitypub/type.ts b/packages/backend/src/core/activitypub/type.ts
index 7496315f09..b5eb643e0e 100644
--- a/packages/backend/src/core/activitypub/type.ts
+++ b/packages/backend/src/core/activitypub/type.ts
@@ -103,14 +103,14 @@ export interface IActivity extends IObject {
 
 export interface ICollection extends IObject {
 	type: 'Collection';
-	totalItems: number;
+	totalItems?: number;
 	first?: IObject | string;
 	items?: ApObject;
 }
 
 export interface IOrderedCollection extends IObject {
 	type: 'OrderedCollection';
-	totalItems: number;
+	totalItems?: number;
 	first?: IObject | string;
 	orderedItems?: ApObject;
 }
@@ -190,6 +190,7 @@ export interface IActor extends IObject {
 	following?: string | ICollection | IOrderedCollection;
 	featured?: string | IOrderedCollection;
 	outbox: string | IOrderedCollection;
+	liked?: string | ICollection | IOrderedCollection;
 	endpoints?: {
 		sharedInbox?: string;
 	};
diff --git a/packages/backend/src/core/entities/UserEntityService.ts b/packages/backend/src/core/entities/UserEntityService.ts
index d3c087a153..1e19d6b976 100644
--- a/packages/backend/src/core/entities/UserEntityService.ts
+++ b/packages/backend/src/core/entities/UserEntityService.ts
@@ -545,7 +545,7 @@ export class UserEntityService implements OnModuleInit {
 				}),
 				pinnedPageId: profile!.pinnedPageId,
 				pinnedPage: profile!.pinnedPageId ? this.pageEntityService.pack(profile!.pinnedPageId, me) : null,
-				publicReactions: this.isLocalUser(user) ? profile!.publicReactions : false, // https://github.com/misskey-dev/misskey/issues/12964
+				publicReactions: profile!.publicReactions,
 				followersVisibility: profile!.followersVisibility,
 				followingVisibility: profile!.followingVisibility,
 				roles: this.roleService.getUserRoles(user.id).then(roles => roles.filter(role => role.isPublic).sort((a, b) => b.displayOrder - a.displayOrder).map(role => ({
diff --git a/packages/backend/src/server/ActivityPubServerService.ts b/packages/backend/src/server/ActivityPubServerService.ts
index f34f6583d3..01a71073ef 100644
--- a/packages/backend/src/server/ActivityPubServerService.ts
+++ b/packages/backend/src/server/ActivityPubServerService.ts
@@ -352,6 +352,98 @@ export class ActivityPubServerService {
 		}
 	}
 
+	@bindThis
+	private async liked(
+		request: FastifyRequest<{ Params: { user: string; }; Querystring: { cursor?: string; page?: string; }; }>,
+		reply: FastifyReply,
+	) {
+		const userId = request.params.user;
+
+		const cursor = request.query.cursor;
+		if (cursor != null && typeof cursor !== 'string') {
+			reply.code(400);
+			return;
+		}
+
+		const page = request.query.page === 'true';
+
+		const user = await this.usersRepository.findOneBy({
+			id: userId,
+			host: IsNull(),
+		});
+
+		if (user == null) {
+			reply.code(404);
+			return;
+		}
+
+		const profile = await this.userProfilesRepository.findOneByOrFail({ userId: user.id });
+
+		if (!profile.publicReactions) {
+			reply.code(403);
+			reply.header('Cache-Control', 'public, max-age=30');
+			return;
+		}
+
+		const limit = 10;
+		const partOf = `${this.config.url}/users/${userId}/liked`;
+
+		if (page) {
+			const query = this.noteReactionsRepository.createQueryBuilder('reaction')
+				.andWhere('reaction.userId = :userId', { userId: user.id });
+
+			// カーソルが指定されている場合
+			if (cursor) {
+				query.andWhere('reaction.id < :id', { id: cursor });
+			}
+
+			const reactions = await query
+				.limit(limit + 1)
+				.orderBy('reaction.id', 'DESC')
+				.innerJoinAndSelect('reaction.note', 'note')
+				.leftJoinAndSelect('note.user', 'noteUser')
+				.andWhere(new Brackets(qb => {
+					qb
+						.where('note.visibility = \'public\'')
+						.orWhere('note.visibility = \'home\'');
+				}))
+				.andWhere('note.localOnly = FALSE')
+				.andWhere('noteUser.isSuspended = FALSE')
+				.getMany();
+
+			// 「次のページ」があるかどうか
+			const inStock = reactions.length === limit + 1;
+			if (inStock) reactions.pop();
+
+			const reactedNotes = await Promise.all(reactions.map(({ note }) => note!.uri || this.apRendererService.renderNote(note!, false)));
+			const rendered = this.apRendererService.renderOrderedCollectionPage(
+				`${partOf}?${url.query({
+					page: 'true',
+					cursor,
+				})}`,
+				undefined, reactedNotes, partOf,
+				undefined,
+				inStock ? `${partOf}?${url.query({
+					page: 'true',
+					cursor: reactions.at(-1)!.id,
+				})}` : undefined,
+			);
+
+			this.setResponseType(request, reply);
+			return (this.apRendererService.addContext(rendered));
+		} else {
+			// index page
+			const rendered = this.apRendererService.renderOrderedCollection(
+				partOf,
+				undefined,
+				`${partOf}?page=true`,
+			);
+			reply.header('Cache-Control', 'public, max-age=180');
+			this.setResponseType(request, reply);
+			return (this.apRendererService.addContext(rendered));
+		}
+	}
+
 	@bindThis
 	private async featured(request: FastifyRequest<{ Params: { user: string; }; }>, reply: FastifyReply) {
 		const userId = request.params.user;
@@ -629,6 +721,12 @@ export class ActivityPubServerService {
 			Querystring: { cursor?: string; page?: string; };
 		}>('/users/:user/following', async (request, reply) => await this.following(request, reply));
 
+		// liked
+		fastify.get<{
+			Params: { user: string; };
+			Querystring: { cursor?: string; page?: string; };
+		}>('/users/:user/liked', async (request, reply) => await this.liked(request, reply));
+
 		// featured
 		fastify.get<{ Params: { user: string; }; }>('/users/:user/collections/featured', async (request, reply) => await this.featured(request, reply));
 
diff --git a/packages/backend/src/server/api/endpoints/users/reactions.ts b/packages/backend/src/server/api/endpoints/users/reactions.ts
index 7805ae3288..25a436707f 100644
--- a/packages/backend/src/server/api/endpoints/users/reactions.ts
+++ b/packages/backend/src/server/api/endpoints/users/reactions.ts
@@ -10,7 +10,6 @@ import { QueryService } from '@/core/QueryService.js';
 import { NoteReactionEntityService } from '@/core/entities/NoteReactionEntityService.js';
 import { DI } from '@/di-symbols.js';
 import { CacheService } from '@/core/CacheService.js';
-import { UserEntityService } from '@/core/entities/UserEntityService.js';
 import { RoleService } from '@/core/RoleService.js';
 import { isUserRelated } from '@/misc/is-user-related.js';
 import { ApiError } from '../../error.js';
@@ -38,11 +37,6 @@ export const meta = {
 			code: 'REACTIONS_NOT_PUBLIC',
 			id: '673a7dd2-6924-1093-e0c0-e68456ceae5c',
 		},
-		isRemoteUser: {
-			message: 'Currently unavailable to display reactions of remote users. See https://github.com/misskey-dev/misskey/issues/12964',
-			code: 'IS_REMOTE_USER',
-			id: '6b95fa98-8cf9-2350-e284-f0ffdb54a805',
-		},
 	},
 } as const;
 
@@ -69,7 +63,6 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		private noteReactionsRepository: NoteReactionsRepository,
 
 		private cacheService: CacheService,
-		private userEntityService: UserEntityService,
 		private noteReactionEntityService: NoteReactionEntityService,
 		private queryService: QueryService,
 		private roleService: RoleService,
@@ -78,11 +71,6 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 			const userIdsWhoBlockingMe = me ? await this.cacheService.userBlockedCache.fetch(me.id) : new Set<string>();
 			const iAmModerator = me ? await this.roleService.isModerator(me) : false; // Moderators can see reactions of all users
 			if (!iAmModerator) {
-				const user = await this.cacheService.findUserById(ps.userId);
-				if (this.userEntityService.isRemoteUser(user)) {
-					throw new ApiError(meta.errors.isRemoteUser);
-				}
-
 				const profile = await this.userProfilesRepository.findOneByOrFail({ userId: ps.userId });
 				if ((me == null || me.id !== ps.userId) && !profile.publicReactions) {
 					throw new ApiError(meta.errors.reactionsNotPublic);
diff --git a/packages/backend/test-federation/test/user.test.ts b/packages/backend/test-federation/test/user.test.ts
index 76605e61d4..af29b72f2a 100644
--- a/packages/backend/test-federation/test/user.test.ts
+++ b/packages/backend/test-federation/test/user.test.ts
@@ -43,12 +43,11 @@ describe('User', () => {
 					'uri',
 					'createdAt',
 					'lastFetchedAt',
-					'publicReactions',
 				]);
 			});
 		});
 
-		describe('ffVisibility is federated', () => {
+		describe('ff/reactions visibility is federated', () => {
 			let alice: LoginUser, bob: LoginUser;
 			let bobInA: Misskey.entities.UserDetailedNotMe, aliceInB: Misskey.entities.UserDetailedNotMe;
 
@@ -78,6 +77,7 @@ describe('User', () => {
 				])) {
 					strictEqual(user.followersVisibility, 'public');
 					strictEqual(user.followingVisibility, 'public');
+					strictEqual(user.publicReactions, true);
 				}
 			});
 
@@ -113,6 +113,22 @@ describe('User', () => {
 					strictEqual(user.followingVisibility, 'private');
 				}
 			});
+
+			test.skip('Setting false for publicReactions is federated', async () => {
+				await Promise.all([
+					alice.client.request('i/update', { publicReactions: false }),
+					bob.client.request('i/update', { publicReactions: false }),
+				]);
+				await sleep();
+
+				for (const user of await Promise.all([
+					alice.client.request('users/show', { userId: bobInA.id }),
+					bob.client.request('users/show', { userId: aliceInB.id }),
+				])) {
+					strictEqual(user.publicReactions, false);
+					strictEqual(user.publicReactions, false);
+				}
+			});
 		});
 
 		describe('isCat is federated', () => {
diff --git a/packages/backend/test/unit/activitypub.ts b/packages/backend/test/unit/activitypub.ts
index 9df947982b..26f11a2086 100644
--- a/packages/backend/test/unit/activitypub.ts
+++ b/packages/backend/test/unit/activitypub.ts
@@ -213,7 +213,7 @@ describe('ActivityPub', () => {
 	});
 
 	describe('Collection visibility', () => {
-		test('Public following/followers', async () => {
+		test('Public following/followers/reactions', async () => {
 			const actor = createRandomActor();
 			actor.following = {
 				id: `${actor.id}/following`,
@@ -222,6 +222,12 @@ describe('ActivityPub', () => {
 				first: `${actor.id}/following?page=1`,
 			};
 			actor.followers = `${actor.id}/followers`;
+			actor.liked = {
+				id: `${actor.id}/following`,
+				type: 'OrderedCollection',
+				totalItems: 0,
+				orderedItems: [],
+			};
 
 			resolver.register(actor.id, actor);
 			resolver.register(actor.followers, {
@@ -236,9 +242,10 @@ describe('ActivityPub', () => {
 
 			assert.deepStrictEqual(userProfile.followingVisibility, 'public');
 			assert.deepStrictEqual(userProfile.followersVisibility, 'public');
+			assert.deepStrictEqual(userProfile.publicReactions, true);
 		});
 
-		test('Private following/followers', async () => {
+		test('Private following/followers/reactions', async () => {
 			const actor = createRandomActor();
 			actor.following = {
 				id: `${actor.id}/following`,
@@ -247,6 +254,7 @@ describe('ActivityPub', () => {
 				// first: …
 			};
 			actor.followers = `${actor.id}/followers`;
+			// actor.liked = …;
 
 			resolver.register(actor.id, actor);
 			//resolver.register(actor.followers, { … });
@@ -256,6 +264,7 @@ describe('ActivityPub', () => {
 
 			assert.deepStrictEqual(userProfile.followingVisibility, 'private');
 			assert.deepStrictEqual(userProfile.followersVisibility, 'private');
+			assert.deepStrictEqual(userProfile.publicReactions, false);
 		});
 	});