diff --git a/packages/backend/src/server/api/endpoints/i/known-as.ts b/packages/backend/src/server/api/endpoints/i/known-as.ts
index 5e86e8b955..d4d9061b30 100644
--- a/packages/backend/src/server/api/endpoints/i/known-as.ts
+++ b/packages/backend/src/server/api/endpoints/i/known-as.ts
@@ -1,4 +1,4 @@
-import type { User, UserDetailedNotMeOnly } from "@/models/entities/user.js";
+import type { User } from "@/models/entities/user.js";
 import { Users } from "@/models/index.js";
 import { resolveUser } from "@/remote/resolve-user.js";
 import acceptAllFollowRequests from "@/services/following/requests/accept-all.js";
@@ -6,10 +6,9 @@ import { publishToFollowers } from "@/services/i/update.js";
 import { publishMainStream } from "@/services/stream.js";
 import { DAY } from "@/const.js";
 import { apiLogger } from "../../logger.js";
-import { UserProfiles } from "@/models/index.js";
-import config from "@/config/index.js";
 import define from "../../define.js";
 import { ApiError } from "../../error.js";
+import { parse } from "@/misc/acct.js";
 
 export const meta = {
 	tags: ["users"],
@@ -38,49 +37,57 @@ export const meta = {
 			code: "URI_NULL",
 			id: "bf326f31-d430-4f97-9933-5d61e4d48a23",
 		},
+		alreadyMoved: {
+			message: 'You have already moved your account.',
+			code: 'ALREADY_MOVED',
+			id: '56f20ec9-fd06-4fa5-841b-edd6d7d4fa31',
+		},
+		yourself: {
+			message: 'You can\'t set yourself as your own alias.',
+			code: 'FORBIDDEN_TO_SET_YOURSELF',
+			id: '25c90186-4ab0-49c8-9bba-a1fa6c202ba4',
+		},
 	},
 } as const;
 
 export const paramDef = {
 	type: "object",
 	properties: {
-		alsoKnownAs: { type: "string" },
+		alsoKnownAs: {
+			type: 'array',
+			maxItems: 10,
+			uniqueItems: true,
+			items: { type: 'string' },
+		},
 	},
 	required: ["alsoKnownAs"],
 } as const;
 
 export default define(meta, paramDef, async (ps, user) => {
 	if (!ps.alsoKnownAs) throw new ApiError(meta.errors.noSuchUser);
+	if (user.movedToUri) throw new ApiError(meta.errors.alreadyMoved);
 
-	let unfiltered: string = ps.alsoKnownAs;
-	const updates = {} as Partial<User>;
+	const newAka = new Set<string>();
 
-	if (!unfiltered) {
-		updates.alsoKnownAs = null;
-	} else {
-		if (unfiltered.startsWith("acct:")) unfiltered = unfiltered.substring(5);
-		if (unfiltered.startsWith("@")) unfiltered = unfiltered.substring(1);
-		if (!unfiltered.includes("@")) throw new ApiError(meta.errors.notRemote);
+	for (const line of ps.alsoKnownAs) {
+		if (!line) throw new ApiError(meta.errors.noSuchUser);
+		const { username, host } = parse(line);
 
-		const userAddress: string[] = unfiltered.split("@");
-		const knownAs = await resolveUser(userAddress[0], userAddress[1]).catch(
-			(e) => {
-				apiLogger.warn(`failed to resolve remote user: ${e}`);
-				throw new ApiError(meta.errors.noSuchUser);
-			},
-		);
+		const aka = await resolveUser(username, host).catch((e) => {
+			apiLogger.warn(`failed to resolve remote user: ${e}`);
+			throw new ApiError(meta.errors.noSuchUser);
+		});
 
-		const toUrl: string | null = knownAs.uri;
-		if (!toUrl) {
-			throw new ApiError(meta.errors.uriNull);
-		}
-		if (updates.alsoKnownAs == null || updates.alsoKnownAs.length === 0) {
-			updates.alsoKnownAs = [toUrl];
-		} else {
-			updates.alsoKnownAs.push(toUrl);
-		}
+		if (aka.id === user.id) throw new ApiError(meta.errors.yourself);
+		if (!aka.uri) throw new ApiError(meta.errors.uriNull);
+
+		newAka.add(aka.uri);
 	}
 
+	const updates = {
+		alsoKnownAs: newAka.size > 0 ? Array.from(newAka) : null,
+	} as Partial<User>;
+
 	await Users.update(user.id, updates);
 
 	const iObj = await Users.pack<true, true>(user.id, user, {
diff --git a/packages/backend/src/server/api/endpoints/users/show.ts b/packages/backend/src/server/api/endpoints/users/show.ts
index 49cac81fdb..bead8df0a4 100644
--- a/packages/backend/src/server/api/endpoints/users/show.ts
+++ b/packages/backend/src/server/api/endpoints/users/show.ts
@@ -54,7 +54,7 @@ export const paramDef = {
 	anyOf: [
 		{
 			properties: {
-				userId: { type: "string", format: "misskey:id" },
+				userId: { type: "string" },
 			},
 			required: ["userId"],
 		},
@@ -65,7 +65,6 @@ export const paramDef = {
 					uniqueItems: true,
 					items: {
 						type: "string",
-						format: "misskey:id",
 					},
 				},
 			},
@@ -95,21 +94,27 @@ export default define(meta, paramDef, async (ps, me) => {
 			return [];
 		}
 
-		const users = await Users.findBy(
-			isAdminOrModerator
-				? {
-						id: In(ps.userIds),
-				  }
-				: {
-						id: In(ps.userIds),
-						isSuspended: false,
-				  },
-		);
+		const isUrl = ps.userIds[0].startsWith("http");
+		let users: User[];
+		if (isUrl) {
+			users = await Users.findBy(
+				isAdminOrModerator
+					? { uri: In(ps.userIds) }
+					: { uri: In(ps.userIds), isSuspended: false },
+			);
+		} else {
+			users = await Users.findBy(
+				isAdminOrModerator
+					? { id: In(ps.userIds) }
+					: { id: In(ps.userIds), isSuspended: false },
+			);
+		}
 
 		// リクエストされた通りに並べ替え
 		const _users: User[] = [];
 		for (const id of ps.userIds) {
-			_users.push(users.find((x) => x.id === id)!);
+			const res = users.find((x) => (isUrl ? x.uri === id : x.id === id));
+			if (res) _users.push(res);
 		}
 
 		return await Promise.all(
@@ -129,7 +134,9 @@ export default define(meta, paramDef, async (ps, me) => {
 		} else {
 			const q: FindOptionsWhere<User> =
 				ps.userId != null
-					? { id: ps.userId }
+					? ps.userId.startsWith("http")
+						? { uri: ps.userId }
+						: { id: ps.userId }
 					: { usernameLower: ps.username!.toLowerCase(), host: IsNull() };
 
 			user = await Users.findOneBy(q);
diff --git a/packages/client/src/pages/settings/migration.vue b/packages/client/src/pages/settings/migration.vue
index 6d5b435e3b..610d1ce1fe 100644
--- a/packages/client/src/pages/settings/migration.vue
+++ b/packages/client/src/pages/settings/migration.vue
@@ -2,14 +2,10 @@
 	<div class="_formRoot">
 		<FormSection>
 			<template #label>{{ i18n.ts.moveTo }}</template>
+			<FormInfo warn class="_formBlock">{{ i18n.ts.moveAccountDescription }}</FormInfo>
 			<FormInput v-model="moveToAccount" class="_formBlock">
-				<template #prefix
-					><i class="ph-airplane-takeoff ph-bold ph-lg"></i
-				></template>
+				<template #prefix><i class="ph-airplane-takeoff ph-bold ph-lg"></i></template>
 				<template #label>{{ i18n.ts.moveToLabel }}</template>
-				<template #caption>{{
-					i18n.ts.moveAccountDescription
-				}}</template>
 			</FormInput>
 			<FormButton primary danger @click="move(moveToAccount)">
 				{{ i18n.ts.moveAccount }}
@@ -18,19 +14,15 @@
 
 		<FormSection>
 			<template #label>{{ i18n.ts.moveFrom }}</template>
-			<FormInput v-model="accountAlias" class="_formBlock">
-				<template #prefix
-					><i class="ph-airplane-landing ph-bold ph-lg"></i
-				></template>
-				<template #label>{{ i18n.ts.moveFromLabel }}</template>
-				<template #caption>{{ i18n.ts.moveFromDescription }}</template>
+			<FormInfo warn class="_formBlock">{{ i18n.ts.moveFromDescription }}</FormInfo>
+			<FormInput v-for="(_, i) in accountAlias" v-model="accountAlias[i]" class="_formBlock">
+				<template #prefix><i class="ph-airplane-landing ph-bold ph-lg"></i></template>
+				<template #label>{{ `#${i + 1} ${i18n.ts.moveFromLabel}` }}</template>
 			</FormInput>
-			<FormButton
-				class="button"
-				inline
-				primary
-				@click="save(accountAlias.toString())"
-			>
+			<FormButton class="button" :disabled="accountAlias.length >= 10" inline style="margin-right: 8px" @click="add"><i
+					class="ph-plus ph-bold ph-lg"></i>
+				{{ i18n.ts.add }}</FormButton>
+			<FormButton class="button" inline primary @click="save">
 				<i class="ph-floppy-disk-back ph-bold ph-lg"></i>
 				{{ i18n.ts.save }}
 			</FormButton>
@@ -42,17 +34,35 @@
 import FormSection from "@/components/form/section.vue";
 import FormInput from "@/components/form/input.vue";
 import FormButton from "@/components/MkButton.vue";
+import FormInfo from "@/components/MkInfo.vue";
 import * as os from "@/os";
 import { i18n } from "@/i18n";
 import { definePageMetadata } from "@/scripts/page-metadata";
+import { $i } from "@/account";
+import { toString } from 'calckey-js/built/acct';
 
 let moveToAccount = $ref("");
-let accountAlias = $ref("");
+let accountAlias = $ref([""]);
 
-async function save(account): Promise<void> {
-	os.apiWithDialog("i/known-as", {
-		alsoKnownAs: account,
+await init();
+
+async function init() {
+	if ($i?.alsoKnownAs && $i.alsoKnownAs.length > 0) {
+		const aka = await os.api('users/show', { userIds: $i.alsoKnownAs });
+		accountAlias = (aka && aka.length > 0) ? aka.map(user => `@${toString(user)}`) : [''];
+	}
+}
+
+async function save(): Promise<void> {
+	const i = os.apiWithDialog("i/known-as", {
+		alsoKnownAs: accountAlias.map(e => e.trim()).filter(e => e !== ""),
 	});
+	$i.alsoKnownAs = i.alsoKnownAs;
+	await init();
+}
+
+function add(): void {
+	accountAlias.push('');
 }
 
 async function move(account): Promise<void> {