diff --git a/src/backend/router.ts b/src/backend/router.ts
index 04b10ce..97bfcb8 100644
--- a/src/backend/router.ts
+++ b/src/backend/router.ts
@@ -156,6 +156,10 @@ router.get('/announcements/:id', async (ctx) => {
 	} : null);
 });
 
+router.get('/__rescue__', async(ctx) => {
+	await ctx.render('rescue');
+});
+
 router.get('(.*)', async (ctx) => {
 	await ctx.render('frontend');
 });
diff --git a/src/backend/views/rescue.pug b/src/backend/views/rescue.pug
new file mode 100644
index 0000000..7620399
--- /dev/null
+++ b/src/backend/views/rescue.pug
@@ -0,0 +1,13 @@
+doctype html
+html
+	head
+		meta(charset="UTF-8")
+	body
+		p 問題を修正するため、端末に残ったデータを削除しました。
+		p 5秒後にトップページに移動します。
+		hr
+		p To solve the problem, deleted data remaining on the device.
+		p After 5 seconds, you will be redirected to the top page.
+		script.
+			localStorage.clear();
+			setTimeout(() => location.href = '/', 5000);