diff --git a/packages/backend/src/core/entities/UserEntityService.ts b/packages/backend/src/core/entities/UserEntityService.ts
index 3524119ba1..326baaefd4 100644
--- a/packages/backend/src/core/entities/UserEntityService.ts
+++ b/packages/backend/src/core/entities/UserEntityService.ts
@@ -487,7 +487,10 @@ export class UserEntityService implements OnModuleInit {
 			includeSecrets: false,
 		}, options);
 
-		const user = typeof src === 'object' ? src : await this.usersRepository.findOneByOrFail({ id: src });
+		const user = typeof src === 'object' ? src : await this.usersRepository.findOneOrFail({
+			where: { id: src },
+			relations: { userProfile: true },
+		});
 
 		// migration
 		if (user.avatarId != null && user.avatarUrl === null) {
@@ -521,7 +524,7 @@ export class UserEntityService implements OnModuleInit {
 		const iAmModerator = me ? await this.roleService.isModerator(me as MiUser) : false;
 
 		const profile = isDetailed
-			? (opts.userProfile ?? await this.userProfilesRepository.findOneByOrFail({ userId: user.id }))
+			? (opts.userProfile ?? user.userProfile ?? await this.userProfilesRepository.findOneByOrFail({ userId: user.id }))
 			: null;
 
 		let relation: UserRelation | null = null;
@@ -556,7 +559,7 @@ export class UserEntityService implements OnModuleInit {
 			}
 		}
 
-		const mastoapi = !isDetailed ? opts.userProfile ?? await this.userProfilesRepository.findOneByOrFail({ userId: user.id }) : null;
+		const mastoapi = !isDetailed ? opts.userProfile ?? user.userProfile ?? await this.userProfilesRepository.findOneByOrFail({ userId: user.id }) : null;
 
 		const followingCount = profile == null ? null :
 			(profile.followingVisibility === 'public') || isMe || iAmModerator ? user.followingCount :
@@ -785,8 +788,13 @@ export class UserEntityService implements OnModuleInit {
 		const _users = users.filter((user): user is MiUser => typeof user !== 'string');
 		if (_users.length !== users.length) {
 			_users.push(
-				...await this.usersRepository.findBy({
-					id: In(users.filter((user): user is string => typeof user === 'string')),
+				...await this.usersRepository.find({
+					where: {
+						id: In(users.filter((user): user is string => typeof user === 'string')),
+					},
+					relations: {
+						userProfile: true,
+					},
 				}),
 			);
 		}
@@ -800,8 +808,20 @@ export class UserEntityService implements OnModuleInit {
 		let pinNotes: Map<MiUser['id'], MiUserNotePining[]> = new Map();
 
 		if (options?.schema !== 'UserLite') {
-			profilesMap = await this.userProfilesRepository.findBy({ userId: In(_userIds) })
-				.then(profiles => new Map(profiles.map(p => [p.userId, p])));
+			const _profiles: MiUserProfile[] = [];
+			const _profilesToFetch: string[] = [];
+			for (const user of _users) {
+				if (user.userProfile) {
+					_profiles.push(user.userProfile);
+				} else {
+					_profilesToFetch.push(user.id);
+				}
+			}
+			if (_profilesToFetch.length > 0) {
+				const fetched = await this.userProfilesRepository.findBy({ userId: In(_profilesToFetch) });
+				_profiles.push(...fetched);
+			}
+			profilesMap = new Map(_profiles.map(p => [p.userId, p]));
 
 			const meId = me ? me.id : null;
 			if (meId) {
diff --git a/packages/backend/src/models/User.ts b/packages/backend/src/models/User.ts
index 3ef5817672..2f13400944 100644
--- a/packages/backend/src/models/User.ts
+++ b/packages/backend/src/models/User.ts
@@ -8,6 +8,7 @@ import { type UserUnsignedFetchOption, userUnsignedFetchOptions } from '@/const.
 import { MiInstance } from '@/models/Instance.js';
 import { id } from './util/id.js';
 import { MiDriveFile } from './DriveFile.js';
+import type { MiUserProfile } from './UserProfile.js';
 
 @Entity('user')
 @Index(['usernameLower', 'host'], { unique: true })
@@ -395,6 +396,9 @@ export class MiUser {
 	})
 	public attributionDomains: string[];
 
+	@OneToOne('user_profile', (profile: MiUserProfile) => profile.user)
+	public userProfile: MiUserProfile | null;
+
 	constructor(data: Partial<MiUser>) {
 		if (data == null) return;
 
diff --git a/packages/backend/src/models/UserProfile.ts b/packages/backend/src/models/UserProfile.ts
index 29c453dd71..6ee72e6ddd 100644
--- a/packages/backend/src/models/UserProfile.ts
+++ b/packages/backend/src/models/UserProfile.ts
@@ -17,7 +17,7 @@ export class MiUserProfile {
 	@PrimaryColumn(id())
 	public userId: MiUser['id'];
 
-	@OneToOne(type => MiUser, {
+	@OneToOne(() => MiUser, user => user.userProfile, {
 		onDelete: 'CASCADE',
 	})
 	@JoinColumn()