diff --git a/app/src/components/ControlPalette.vue b/app/src/components/ControlPalette.vue
index 470a29a..6d80f56 100644
--- a/app/src/components/ControlPalette.vue
+++ b/app/src/components/ControlPalette.vue
@@ -25,10 +25,10 @@
 </template>
 
 <script setup>
-import sessionManager from '../utils/session'
+import { createSession } from '../store/session'
 
 const reset = async () => {
   console.log('resetting...')
-  await sessionManager.createSession()
+  await createSession()
 }
 </script>
diff --git a/app/src/components/GameHeaderPart.vue b/app/src/components/GameHeaderPart.vue
index 093047f..7fb256b 100644
--- a/app/src/components/GameHeaderPart.vue
+++ b/app/src/components/GameHeaderPart.vue
@@ -4,12 +4,18 @@ import { useRouter } from 'vue-router'
 import { logout } from '../utils/auth'
 import { bugReportUrl } from '../config'
 import api from '../utils/api'
+import { reset } from '../store/session'
 
 const router = useRouter()
 
 const handleLogout = async () => {
-  await logout()
-  router.push({ name: 'login' })
+  try {
+    await logout()
+    reset()
+    router.push({ name: 'login' })
+  } catch (err) {
+    console.error(err)
+  }
 }
 
 const questData = ref(null)
diff --git a/app/src/components/HintPart.vue b/app/src/components/HintPart.vue
index 3656d00..dad0189 100644
--- a/app/src/components/HintPart.vue
+++ b/app/src/components/HintPart.vue
@@ -1,11 +1,15 @@
 <script setup>
 import { ref, watch } from 'vue'
-import sessionManager from '../utils/session'
+import sessionStore from '../store/session'
 
 const current = ref(-1)
-watch(sessionManager.hints, (hints) => {
-  current.value = hints.length - 1
-})
+watch(
+  () => sessionStore.session.hints,
+  (hints) => {
+    current.value = hints.length - 1
+  },
+  { deep: true }
+)
 
 const left = () => {
   if (current.value > 0) {
@@ -14,7 +18,7 @@ const left = () => {
 }
 
 const right = () => {
-  if (current.value < sessionManager.hints.value.length - 1) {
+  if (current.value < sessionStore.session.hints.length - 1) {
     current.value += 1
   }
 }
@@ -43,13 +47,13 @@ const right = () => {
       <p class="inline text-text font-xl w-1/14 p-2 m-1">{{ current + 1 }}</p>
       <p class="inline text-text font-xl w-1/14 p-2 m-1">/</p>
       <p class="inline text-text font-xl w-1/14 p-2 m-1">
-        {{ sessionManager.hints.value.length }}
+        {{ sessionStore.session.hints.length }}
       </p>
       <button
         class="p-2 m-1 w-1/8"
         id="Rbutton"
         @click="right"
-        :disabled="current === sessionManager.hints.value.length - 1"
+        :disabled="current === sessionStore.session.hints.length - 1"
       >
         <font-awesome-icon :icon="['fas', 'arrow-right']" class="text-text" />
       </button>
@@ -57,7 +61,7 @@ const right = () => {
   </div>
   <div id="hint" class="bg-bg flex flex-wrap p-8">
     <p class="text-text font-xl whitespace-pre-wrap">
-      {{ sessionManager.hints.value[current] }}
+      {{ sessionStore.session.hints[current] }}
     </p>
     <br />
   </div>
diff --git a/app/src/components/QuestPart.vue b/app/src/components/QuestPart.vue
index bbed861..10d06f2 100644
--- a/app/src/components/QuestPart.vue
+++ b/app/src/components/QuestPart.vue
@@ -1,37 +1,20 @@
 <script setup>
-import { onMounted, ref } from 'vue'
-import api from '../utils/api'
-import sessionManager from '../utils/session'
-
-const questData = ref(null)
-const questErr = ref(null)
-
-onMounted(async () => {
-  try {
-    const res = await api.get('/quests/helloworld')
-    questData.value = res.data
-  } catch (err) {
-    questErr.value = err
-  }
-})
+import sessionStore from '../store/session'
 </script>
 
 <template>
   <div class="h-full w-full max-h-full">
-    <h1 id="topic" class="text-red-500" v-if="questErr">
-      Failed to get quest infomation
-    </h1>
-    <h1 id="topic" class="text-text" v-else-if="questData">
-      {{ questData.title }}
+    <h1 id="topic" class="text-text" v-if="sessionStore.quest">
+      {{ sessionStore.quest.title }}
     </h1>
     <hr class="border-text-tertiary border-2 my-2" />
     <div>
-      <div v-if="questData" class="whitespace-pre-wrap">
-        <p class="text-text">{{ questData.instruction }}</p>
+      <div v-if="sessionStore.quest" class="whitespace-pre-wrap">
+        <p class="text-text">{{ sessionStore.quest.instruction }}</p>
         <br />
         <p class="text-text">Tasks:</p>
-        <ul v-if="sessionManager.session.value">
-          <li v-for="task in sessionManager.session.value.tasks" :key="task.id">
+        <ul v-if="sessionStore.session">
+          <li v-for="task in sessionStore.session.tasks" :key="task.id">
             <p v-if="task.completed" class="text-text-primary">
               <span class="">✓</span>
               {{ task.name }}
@@ -43,7 +26,6 @@ onMounted(async () => {
           </li>
         </ul>
       </div>
-      <p class="text-red-500" v-else-if="questErr">{{ questErr.message }}</p>
       <p class="text-text" v-else>Loading...</p>
     </div>
   </div>
diff --git a/app/src/components/TerminalPart.vue b/app/src/components/TerminalPart.vue
index d77b891..dadedc6 100644
--- a/app/src/components/TerminalPart.vue
+++ b/app/src/components/TerminalPart.vue
@@ -10,12 +10,13 @@
 
 <script setup>
 import { onMounted, ref } from 'vue'
-import sessionManager from '../utils/session'
+import { useTerminal } from '../store/session'
 
 const terminal = ref(null)
 
 onMounted(() => {
-  sessionManager.term.mount(terminal.value)
-  window.addEventListener('resize', () => sessionManager.term.resizeScreen())
+  const term = useTerminal()
+  term.mount(terminal.value)
+  window.addEventListener('resize', () => term.resizeScreen())
 })
 </script>
diff --git a/app/src/components/TreeChart.vue b/app/src/components/TreeChart.vue
index dad6ac6..d71134e 100644
--- a/app/src/components/TreeChart.vue
+++ b/app/src/components/TreeChart.vue
@@ -1,6 +1,6 @@
 <script setup>
 import FileNode from './FileNode.vue'
-import sessionManager from '../utils/session.js'
+import sessionStore from '../store/session.js'
 </script>
 
 <template>
@@ -8,8 +8,8 @@ import sessionManager from '../utils/session.js'
     <ul>
       <li>
         <FileNode
-          :node="sessionManager.graph.value"
-          :pwd="sessionManager.pwd.value"
+          :node="sessionStore.session.graph"
+          :pwd="sessionStore.session.pwd"
         />
       </li>
     </ul>
diff --git a/app/src/store/session.js b/app/src/store/session.js
new file mode 100644
index 0000000..eae3b08
--- /dev/null
+++ b/app/src/store/session.js
@@ -0,0 +1,127 @@
+import { reactive } from 'vue'
+import { FileGraph } from '@linux-odyssey/file-graph'
+import api from '../utils/api'
+import Socket from '../utils/socket'
+import SocketTerminal from '../utils/terminal'
+
+function newSession() {
+  const graph = new FileGraph({
+    path: '/',
+    type: 'folder',
+    discovered: false,
+  })
+  return {
+    status: 'inactive',
+    graph,
+    pwd: '',
+    hints: [],
+    tasks: [],
+  }
+}
+
+const store = reactive({
+  session: newSession(),
+  questId: '',
+  quest: null,
+})
+
+const socket = new Socket()
+const term = new SocketTerminal(40, 80)
+
+function setQuest(questId) {
+  api.get(`/quests/${questId}`).then((res) => {
+    store.questId = res.data._id
+    store.quest = res.data
+  })
+}
+
+async function setSession(session) {
+  store.session = session
+  store.session.graph = new FileGraph(session.graph)
+  term.reset()
+  await socket.connect(session)
+  term.focus()
+}
+
+export async function createSession() {
+  console.log('Creating a new session...')
+  const res = await api.post('/sessions', { quest_id: store.questId })
+  const { data } = res
+  await setSession(data)
+}
+
+async function getActiveSession(questId) {
+  const res = await api.post('/sessions/active', {
+    quest_id: questId,
+  })
+  const session = res.data
+  try {
+    await setSession(session)
+  } catch (err) {
+    console.log(err)
+    await createSession().catch(console.error)
+  }
+}
+
+function updateGraph(event) {
+  if (event.discover) {
+    store.session.graph.discover(event.discover)
+  }
+  if (event.pwd) {
+    store.session.pwd = event.pwd
+  }
+}
+
+function updateHints(hints) {
+  store.session.hints.push(...hints)
+}
+
+function updateStatus(status) {
+  store.session.status = status
+}
+
+function setTasks(tasks) {
+  store.session.tasks = tasks
+}
+
+export function useTerminal() {
+  return term
+}
+
+export function reset() {
+  socket.reset()
+  term.reset()
+  store.session = newSession()
+  store.quest = null
+}
+
+export async function init(questId) {
+  reset()
+  await setQuest(questId)
+  await getActiveSession(questId)
+}
+
+function setup() {
+  socket.on('terminal', (data) => {
+    term.write(data)
+  })
+  term.onData((data) => {
+    socket.emit('terminal', data)
+  })
+  socket.on('graph', (event) => {
+    updateGraph(event)
+  })
+  socket.on('hints', (event) => {
+    updateHints(event)
+  })
+  socket.on('tasks', (tasks) => {
+    setTasks(tasks)
+  })
+  socket.on('status', (event) => {
+    updateStatus(event)
+  })
+}
+
+setup()
+
+export default store
diff --git a/app/src/utils/session.js b/app/src/utils/session.js
deleted file mode 100644
index bbf0f3b..0000000
--- a/app/src/utils/session.js
+++ /dev/null
@@ -1,107 +0,0 @@
-import { ref } from 'vue'
-import { FileGraph } from '@linux-odyssey/file-graph'
-import api from './api'
-import Socket from './socket'
-import SocketTerminal from './terminal'
-
-class SessionManager {
-  constructor(questId) {
-    this.questId = questId
-    this.session = ref(null)
-    this.hints = ref([])
-    this.graph = ref(
-      new FileGraph({
-        path: '/',
-        type: 'folder',
-        discovered: false,
-      })
-    )
-    this.pwd = ref('')
-    this.status = ref('inactive')
-    this.socket = new Socket()
-    this.term = new SocketTerminal(40, 80)
-  }
-
-  init() {
-    this.socket.on('terminal', (data) => {
-      this.term.write(data)
-    })
-    this.term.onData((data) => {
-      this.socket.emit('terminal', data)
-    })
-    this.socket.on('graph', (event) => {
-      this.handleGraphUpdate(event)
-    })
-    this.socket.on('hints', (event) => {
-      this.handleHintUpdate(event)
-    })
-    this.socket.on('tasks', (tasks) => {
-      this.setTasks(tasks)
-    })
-    this.socket.on('status', (event) => {
-      this.handleStatusUpdate(event)
-    })
-    return this.getActiveSession()
-  }
-
-  getSession() {
-    return this.session.value
-  }
-
-  async setSession(session) {
-    this.session.value = session
-    this.graph.value = new FileGraph(session.graph)
-    this.hints.value = session.hints
-    this.status.value = session.status
-    this.term.reset()
-    await this.socket.connect(session)
-    this.term.focus()
-  }
-
-  handleGraphUpdate(event) {
-    if (event.discover) {
-      this.graph.value.discover(event.discover)
-    }
-    if (event.pwd) {
-      this.pwd.value = event.pwd
-    }
-  }
-
-  handleHintUpdate(hints) {
-    this.hints.value = [...this.hints.value, ...hints]
-  }
-
-  handleStatusUpdate(status) {
-    this.status.value = status
-  }
-
-  setTasks(tasks) {
-    this.session.value.tasks = tasks
-  }
-
-  async createSession() {
-    console.log('Creating a new session...')
-    const res = await api.post('/sessions', { quest_id: this.questId })
-    const { data } = res
-    console.log('Created Session ID:', data._id)
-    this.setSession(data)
-  }
-
-  async getActiveSession() {
-    const res = await api.post('/sessions/active', {
-      quest_id: this.questId,
-    })
-    const session = res.data
-    console.log(session)
-    try {
-      await this.setSession(session)
-    } catch (err) {
-      console.log(err)
-      this.createSession().catch(console.error)
-    }
-  }
-}
-
-const sessionManager = new SessionManager('helloworld')
-
-export default sessionManager
diff --git a/app/src/utils/socket.js b/app/src/utils/socket.js
index 54fbb49..f242485 100644
--- a/app/src/utils/socket.js
+++ b/app/src/utils/socket.js
@@ -8,10 +8,7 @@ class SocketWrapper {
 
   connect(session) {
     return new Promise((resolve, reject) => {
-      if (this.socket) {
-        this.socket.off()
-        this.socket.disconnect()
-      }
+      this.disconnect()
 
       this.socket = io('', {
         query: {
@@ -38,25 +35,26 @@ class SocketWrapper {
     }
   }
 
-  once(event, callback) {
-    if (this.socket) {
-      this.socket.once(event, callback)
-    }
-  }
-
   bindListeners() {
     this.listeners.forEach(({ event, callback }) => {
       this.socket.on(event, callback)
     })
   }
 
-  send(data) {
-    this.socket.send(data)
-  }
-
   emit(event, data) {
     this.socket.emit(event, data)
   }
+
+  disconnect() {
+    if (this.socket) {
+      this.socket.off()
+      this.socket.disconnect()
+    }
+  }
+
+  reset() {
+    this.disconnect()
+  }
 }
 
 export default SocketWrapper
diff --git a/app/src/views/GamePage.vue b/app/src/views/GamePage.vue
index 9ffbee7..082d692 100644
--- a/app/src/views/GamePage.vue
+++ b/app/src/views/GamePage.vue
@@ -1,6 +1,6 @@
 <script setup>
 import { computed, onMounted } from 'vue'
-import sessionManager from '../utils/session'
+import sessionStore, { init } from '../store/session'
 import GameHeaderPart from '../components/GameHeaderPart.vue'
 import CommandlistPart from '../components/CommandlistPart.vue'
 import HintPart from '../components/HintPart.vue'
@@ -11,11 +11,11 @@ import ControlPalette from '../components/ControlPalette.vue'
 import CompleteModal from '../components/CompleteModal.vue'
 
 const completed = computed(() => {
-  return sessionManager.status.value === 'finished'
+  return sessionStore.session.status === 'finished'
 })
 
 onMounted(async () => {
-  await sessionManager.init()
+  await init('helloworld')
 })
 </script>
 
@@ -28,7 +28,7 @@ onMounted(async () => {
   <input
     type="hidden"
     id="currentStatus"
-    :value="sessionManager.status.value"
+    :value="sessionStore.session.status"
   />
   <!-- main -->
   <div id="main" class="h-[94vh] w-full flex p-3 space-x-3">