diff --git a/packages/frontend/src/account.ts b/packages/frontend/src/account.ts
index 9006150bc83e..17d690cd3a93 100644
--- a/packages/frontend/src/account.ts
+++ b/packages/frontend/src/account.ts
@@ -7,6 +7,7 @@ import { defineAsyncComponent, reactive, ref } from 'vue';
 import * as Misskey from 'misskey-js';
 import { apiUrl } from '@@/js/config.js';
 import type { MenuItem, MenuButton } from '@/types/menu.js';
+import { defaultMemoryStorage } from '@/memory-storage';
 import { showSuspendedDialog } from '@/scripts/show-suspended-dialog.js';
 import { i18n } from '@/i18n.js';
 import { miLocalStorage } from '@/local-storage.js';
@@ -40,6 +41,8 @@ export function incNotesCount() {
 export async function signout() {
 	if (!$i) return;
 
+	defaultMemoryStorage.clear();
+
 	waiting();
 	document.cookie.split(';').forEach((cookie) => {
 		const cookieName = cookie.split('=')[0].trim();
@@ -107,7 +110,7 @@ export async function removeAccount(idOrToken: Account['id']) {
 }
 
 function fetchAccount(token: string, id?: string, forceShowDialog?: boolean): Promise<Account> {
-	document.cookie = "token=; path=/; max-age=0";
+	document.cookie = 'token=; path=/; max-age=0';
 	document.cookie = `token=${token}; path=/queue; max-age=86400; SameSite=Strict; Secure`; // bull dashboardの認証とかで使う
 
 	return new Promise((done, fail) => {
diff --git a/packages/frontend/src/memory-storage.ts b/packages/frontend/src/memory-storage.ts
new file mode 100644
index 000000000000..d1d410e1193d
--- /dev/null
+++ b/packages/frontend/src/memory-storage.ts
@@ -0,0 +1,51 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and misskey-project
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
+export type MemoryStorage = {
+	has: (key: string) => boolean;
+	getItem: <T>(key: string) => T | null;
+	setItem: (key: string, value: unknown) => void;
+	removeItem: (key: string) => void;
+	clear: () => void;
+	size: number;
+};
+
+class MemoryStorageImpl implements MemoryStorage {
+	private readonly storage: Map<string, unknown>;
+
+	constructor() {
+		this.storage = new Map();
+	}
+
+	has(key: string): boolean {
+		return this.storage.has(key);
+	}
+
+	getItem<T>(key: string): T | null {
+		return this.storage.has(key) ? this.storage.get(key) as T : null;
+	}
+
+	setItem(key: string, value: unknown): void {
+		this.storage.set(key, value);
+	}
+
+	removeItem(key: string): void {
+		this.storage.delete(key);
+	}
+
+	clear(): void {
+		this.storage.clear();
+	}
+
+	get size(): number {
+		return this.storage.size;
+	}
+}
+
+export function createMemoryStorage(): MemoryStorage {
+	return new MemoryStorageImpl();
+}
+
+export const defaultMemoryStorage: MemoryStorage = createMemoryStorage();
diff --git a/packages/frontend/src/pages/admin/users.vue b/packages/frontend/src/pages/admin/users.vue
index c9c3d16a2f6e..91104b676d49 100644
--- a/packages/frontend/src/pages/admin/users.vue
+++ b/packages/frontend/src/pages/admin/users.vue
@@ -62,6 +62,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 <script lang="ts" setup>
 import { computed, shallowRef, ref, watchEffect } from 'vue';
 import XHeader from './_header_.vue';
+import { defaultMemoryStorage } from '@/memory-storage';
 import MkButton from '@/components/MkButton.vue';
 import MkInput from '@/components/MkInput.vue';
 import MkSelect from '@/components/MkSelect.vue';
@@ -79,10 +80,10 @@ type SearchQuery = {
 	origin?: string;
 	username?: string;
 	hostname?: string;
-}
+};
 
 const paginationComponent = shallowRef<InstanceType<typeof MkPagination>>();
-const storedQuery = JSON.parse(sessionStorage.getItem('admin-users-query') ?? '{}') as SearchQuery;
+const storedQuery = JSON.parse(defaultMemoryStorage.getItem('admin-users-query') ?? '{}') as SearchQuery;
 
 const sort = ref(storedQuery.sort ?? '+createdAt');
 const state = ref(storedQuery.state ?? 'all');
@@ -159,7 +160,7 @@ const headerActions = computed(() => [{
 const headerTabs = computed(() => []);
 
 watchEffect(() => {
-	sessionStorage.setItem('admin-users-query', JSON.stringify({
+	defaultMemoryStorage.setItem('admin-users-query', JSON.stringify({
 		sort: sort.value,
 		state: state.value,
 		origin: origin.value,