diff --git a/client/src/components/LoginBox.vue b/client/src/components/LoginBox.vue
index 53c2dc2..48574e4 100644
--- a/client/src/components/LoginBox.vue
+++ b/client/src/components/LoginBox.vue
@@ -13,9 +13,8 @@
 import { useRouter } from '#app'
 import { ref, Ref } from 'vue'
 import useAuth from '@/composables/useAuth';
-// import { useMyselfStore } from '~~/src/stores/MyselfStore'
 
-const { validate, setAuthCode } = useAuth()
+const { authenticate, isAuthenticated } = useAuth()
 const router = useRouter()
 
 const vFocus = { mounted: (el: HTMLElement) => el.focus() }
@@ -23,16 +22,14 @@ const vFocus = { mounted: (el: HTMLElement) => el.focus() }
 const authCode: Ref<string> = ref('')
 const errorMessage: Ref<string> = ref('')
 
-
-validate()
-  .then(() => router.push('/play'))
-  .catch(() => null)
+if (await isAuthenticated()) {
+  router.push('/play')
+}
 
 const login = (): void => {
   errorMessage.value = ''
-  setAuthCode(authCode.value)
 
-  validate().then(() => {
+  authenticate(authCode.value).then(() => {
     router.push('/play')
   }).catch(() => {
     errorMessage.value = 'login failed'
diff --git a/client/src/composables/useAuth.ts b/client/src/composables/useAuth.ts
index 447078b..d94d947 100644
--- a/client/src/composables/useAuth.ts
+++ b/client/src/composables/useAuth.ts
@@ -1,26 +1,25 @@
-import { useMyselfStore } from '~~/src/stores/MyselfStore'
-
 export interface useAuth {
-  validate(): Promise<void>
-  setAuthCode(authCode: string): void
+  authenticate(authCode: string): Promise<void>
+  isAuthenticated(): Promise<boolean>
 }
 
 
 export default () => {
-  const MyselfStore = useMyselfStore()
-
   return {
-    validate: async (): Promise<void> => {
-      if (MyselfStore.authCode.length != 6) {
+    isAuthenticated: async (): Promise<boolean> => {
+      return $fetch('/api/userinfo')
+        .then(() => true)
+        .catch(() => false)
+    },
+
+    authenticate: async (authCode: string): Promise<void> => {
+      if (authCode.length != 6) {
         throw Error('login failed')
       }
-      const resp = await $fetch(`/api/login?code=${MyselfStore.authCode}`)
+      const resp = await $fetch(`/api/login?code=${authCode}`)
       if (resp !== 'ok') {
         throw Error('login failed')
       }
     },
-    setAuthCode: (authCode: string): void => {
-      MyselfStore.setAuthCode(authCode)
-    }
   }
 }
diff --git a/client/src/stores/MyselfStore.ts b/client/src/stores/MyselfStore.ts
deleted file mode 100644
index 193f43d..0000000
--- a/client/src/stores/MyselfStore.ts
+++ /dev/null
@@ -1,14 +0,0 @@
-import { defineStore } from 'pinia'
-
-export const useMyselfStore = defineStore('MyselfStore', {
-  state: () => {
-    return {
-      authCode: '',
-    }
-  },
-  actions: {
-    setAuthCode(authCode: string): void {
-      this.authCode = authCode
-    }
-  },
-})
diff --git a/client/src/stores/UserinfoStore.ts b/client/src/stores/UserinfoStore.ts
new file mode 100644
index 0000000..d5c4773
--- /dev/null
+++ b/client/src/stores/UserinfoStore.ts
@@ -0,0 +1,8 @@
+import { defineStore } from 'pinia'
+
+export const useUserinfoStore = defineStore('UserinfoStore', {
+  state: () => {
+    return {
+    }
+  },
+})