diff --git a/src/composable/parseRouteQuery.ts b/src/composable/parseRouteQuery.ts
new file mode 100644
index 0000000..576fd80
--- /dev/null
+++ b/src/composable/parseRouteQuery.ts
@@ -0,0 +1,13 @@
+import type { LocationQueryValue } from 'vue-router'
+
+export const parseRouteQuery = (query: LocationQueryValue | LocationQueryValue[]) => {
+  if (Array.isArray(query)) {
+    return query.filter((v): v is string => typeof v === 'string')
+  } else {
+    return typeof query === 'string' ? [query] : ['']
+  }
+}
+
+export const parseRedirectQuery = (query: LocationQueryValue | LocationQueryValue[]) => {
+  return parseRouteQuery(query)[0] || '/'
+}
diff --git a/src/pages/login/LoginPage.vue b/src/pages/login/LoginPage.vue
new file mode 100644
index 0000000..9f1178d
--- /dev/null
+++ b/src/pages/login/LoginPage.vue
@@ -0,0 +1,49 @@
+<script setup lang="ts">
+import { parseRedirectQuery } from '@/composable/parseRouteQuery'
+import { useAuthStore } from '@/stores/auth'
+import { storeToRefs } from 'pinia'
+import { onMounted, ref } from 'vue'
+import { useRoute, useRouter } from 'vue-router'
+
+const route = useRoute()
+const router = useRouter()
+const authStore = useAuthStore()
+const { isLoggedIn } = storeToRefs(authStore)
+const { login } = authStore
+
+const redirectTo = parseRedirectQuery(route.query.redirect)
+
+const traqIdInput = ref('')
+
+const handleLogin = () => {
+  if (traqIdInput.value) {
+    login(traqIdInput.value)
+    router.push(redirectTo)
+  } else {
+    alert('traQ ID を入力してください。')
+  }
+}
+
+const redirectIfLoggedIn = () => {
+  if (isLoggedIn.value) {
+    router.push(redirectTo)
+  }
+}
+
+onMounted(redirectIfLoggedIn)
+</script>
+
+<template>
+  <div v-if="isLoggedIn">
+    <p>既にログイン済みです。リダイレクトします。</p>
+  </div>
+  <div v-else>
+    <h1>ログイン</h1>
+    <p>traQ OAuth でログインします。(現在はダミー実装です)</p>
+    <div>
+      <label for="traqId">traQ ID:</label>
+      <input type="text" id="traqId" v-model="traqIdInput" />
+    </div>
+    <button @click="handleLogin">ログインする</button>
+  </div>
+</template>
diff --git a/src/pages/membership/MemberShipPageUserTypeSelector.vue b/src/pages/membership/MemberShipPageUserTypeSelector.vue
new file mode 100644
index 0000000..d58074f
--- /dev/null
+++ b/src/pages/membership/MemberShipPageUserTypeSelector.vue
@@ -0,0 +1,17 @@
+<script setup lang="ts">
+import MemberShipPageUserTypeSelectorButton from './MemberShipPageUserTypeSelectorButton.vue'
+</script>
+
+<template>
+  <div class="flex gap-2">
+    <MemberShipPageUserTypeSelectorButton userType="new">
+      新規入部
+    </MemberShipPageUserTypeSelectorButton>
+    <MemberShipPageUserTypeSelectorButton userType="rejoin">
+      再入部
+    </MemberShipPageUserTypeSelectorButton>
+    <MemberShipPageUserTypeSelectorButton userType="active">
+      継続所属
+    </MemberShipPageUserTypeSelectorButton>
+  </div>
+</template>
diff --git a/src/pages/membership/MemberShipPageUserTypeSelectorButton.vue b/src/pages/membership/MemberShipPageUserTypeSelectorButton.vue
new file mode 100644
index 0000000..377359c
--- /dev/null
+++ b/src/pages/membership/MemberShipPageUserTypeSelectorButton.vue
@@ -0,0 +1,19 @@
+<script setup lang="ts">
+import { useRoute, useRouter } from 'vue-router'
+import type { UserType } from './types/userType'
+
+const { userType } = defineProps<{ userType: UserType }>()
+
+const route = useRoute()
+const router = useRouter()
+const replaceUserTypeQuery = (userType: UserType) => {
+  const newQuery = { ...route.query, user_type: userType }
+  router.replace({ query: newQuery })
+}
+</script>
+
+<template>
+  <button @click="replaceUserTypeQuery(userType)">
+    <slot></slot>
+  </button>
+</template>
diff --git a/src/pages/membership/MembershipPage.vue b/src/pages/membership/MembershipPage.vue
index fbb1268..56ff7ca 100644
--- a/src/pages/membership/MembershipPage.vue
+++ b/src/pages/membership/MembershipPage.vue
@@ -1,5 +1,86 @@
+<script setup lang="ts">
+import { useAuthStore } from '@/stores/auth'
+import { useVerifiedEmailStore } from '@/stores/verifiedEmail'
+import { computed, ref } from 'vue'
+import { useRoute } from 'vue-router'
+
+import MemberShipPageVerifyEmailLink from '@/pages/membership/MembershipPageVerifyEmailLink.vue'
+import { storeToRefs } from 'pinia'
+import MemberShipPageUserTypeSelector from './MemberShipPageUserTypeSelector.vue'
+import MembershipPageInputText from './MembershipPageInputText.vue'
+import MembershipPageLoginLink from './MembershipPageLoginLink.vue'
+
+const route = useRoute()
+const { isLoggedIn, loggedInTraqId } = storeToRefs(useAuthStore())
+const { verifiedEmail, hasVerifiedEmail } = storeToRefs(useVerifiedEmailStore())
+
+const isUserTypeNew = computed(() => route.query.user_type === 'new')
+const isUserTypeRejoin = computed(() => route.query.user_type === 'rejoin')
+const isUserTypeActive = computed(() => route.query.user_type === 'active')
+const isUserTypeQueryValid = computed(
+  () => isUserTypeNew.value || isUserTypeRejoin.value || isUserTypeActive.value,
+)
+
+const hasCustomerObjectOnTraqId = ref(false)
+const shouldShowUserTypeSelector = computed(() => !isLoggedIn.value)
+const needUserTypeSelect = computed(() => !isLoggedIn.value && !isUserTypeQueryValid.value)
+const needMailAddressInput = computed(
+  () =>
+    (isLoggedIn.value && !hasCustomerObjectOnTraqId.value && !hasVerifiedEmail.value) ||
+    (!isLoggedIn.value &&
+      (isUserTypeNew.value || isUserTypeRejoin.value) &&
+      !hasVerifiedEmail.value),
+)
+const needLogin = computed(() => isUserTypeActive.value && !isLoggedIn.value)
+
+const hasCustomerObjectOnMailAddress = ref(false)
+const hasTraQIdOnCustomerObject = ref(false)
+const hasCustomerObject = computed(
+  () => hasCustomerObjectOnMailAddress.value || hasCustomerObjectOnTraqId.value,
+)
+const canShowInvoiceForm = computed(
+  () =>
+    (isLoggedIn.value && (hasCustomerObjectOnTraqId.value || hasVerifiedEmail.value)) ||
+    (!isLoggedIn.value &&
+      (isUserTypeNew.value || isUserTypeRejoin.value) &&
+      hasVerifiedEmail.value),
+)
+const needTraqIdInput = computed(
+  () =>
+    isUserTypeRejoin.value &&
+    (!hasCustomerObjectOnMailAddress.value || !hasTraQIdOnCustomerObject.value),
+)
+const traqIdInput = ref('')
+const needNameInput = computed(() => !hasCustomerObject.value)
+const nameInput = ref('')
+const hasValidTraqId = computed(() => !needTraqIdInput.value || traqIdInput.value.length > 0)
+const hasName = computed(() => !needNameInput.value || nameInput.value.length > 0)
+const canShowInvoiceInfoConfirm = computed(
+  () => needNameInput.value && hasValidTraqId.value && hasName.value,
+)
+</script>
+
 <template>
-  <div>
-    <h1>This is an membership page</h1>
+  <div class="flex flex-col gap-2">
+    <div v-if="shouldShowUserTypeSelector">
+      <MemberShipPageUserTypeSelector />
+    </div>
+    <div v-if="needUserTypeSelect">新規入部、再入部、継続所属のいずれかを選択してください</div>
+    <div v-if="needMailAddressInput" class="flex flex-col gap-2">
+      isct アドレスの認証が必要です <MemberShipPageVerifyEmailLink />
+    </div>
+    <div v-if="needLogin" class="flex flex-col gap-2">
+      ログインが必要です
+      <MembershipPageLoginLink />
+    </div>
+    <div v-if="canShowInvoiceForm && needTraqIdInput" class="flex flex-col gap-2">
+      traQ ID を入力してください
+      <MembershipPageInputText v-model="traqIdInput" />
+    </div>
+    <div v-if="canShowInvoiceForm && needNameInput" class="flex flex-col gap-2">
+      名前を入力してください
+      <MembershipPageInputText v-model="nameInput" />
+    </div>
+    <div v-if="canShowInvoiceInfoConfirm">請求書発行のための情報を確認してください</div>
   </div>
 </template>
diff --git a/src/pages/membership/MembershipPageInputText.vue b/src/pages/membership/MembershipPageInputText.vue
new file mode 100644
index 0000000..fc72b17
--- /dev/null
+++ b/src/pages/membership/MembershipPageInputText.vue
@@ -0,0 +1,34 @@
+<script setup lang="ts">
+import { onMounted, useTemplateRef } from 'vue'
+
+const model = defineModel<string>({ required: true })
+const {
+  autoFocus = false,
+  className = 'rounded border px-1',
+  required = false,
+  placeholder = '',
+} = defineProps<{
+  autoFocus?: boolean
+  className?: string
+  required?: boolean
+  placeholder?: string
+}>()
+
+const inputRef = useTemplateRef('input-ref')
+
+onMounted(() => {
+  if (autoFocus) {
+    inputRef.value?.focus()
+  }
+})
+</script>
+
+<template>
+  <input
+    ref="input-ref"
+    :class="className"
+    :placeholder="placeholder"
+    :required="required"
+    v-model="model"
+  />
+</template>
diff --git a/src/pages/membership/MembershipPageLoginLink.vue b/src/pages/membership/MembershipPageLoginLink.vue
new file mode 100644
index 0000000..333abcc
--- /dev/null
+++ b/src/pages/membership/MembershipPageLoginLink.vue
@@ -0,0 +1,13 @@
+<script setup lang="ts">
+import { useRoute } from 'vue-router'
+
+const route = useRoute()
+const getLoginPageURL = {
+  path: '/login',
+  query: { redirect: route.fullPath },
+}
+</script>
+
+<template>
+  <RouterLink :to="getLoginPageURL">ログインへ</RouterLink>
+</template>
diff --git a/src/pages/membership/MembershipPageVerifyEmailLink.vue b/src/pages/membership/MembershipPageVerifyEmailLink.vue
new file mode 100644
index 0000000..bfd5aa2
--- /dev/null
+++ b/src/pages/membership/MembershipPageVerifyEmailLink.vue
@@ -0,0 +1,13 @@
+<script setup lang="ts">
+import { useRoute } from 'vue-router'
+
+const route = useRoute()
+const getVerifyEmailPageURL = {
+  path: '/verify-email',
+  query: { redirect: route.fullPath },
+}
+</script>
+
+<template>
+  <RouterLink :to="getVerifyEmailPageURL">isct アドレスの認証へ</RouterLink>
+</template>
diff --git a/src/pages/membership/types/userType.ts b/src/pages/membership/types/userType.ts
new file mode 100644
index 0000000..97f6762
--- /dev/null
+++ b/src/pages/membership/types/userType.ts
@@ -0,0 +1 @@
+export type UserType = 'new' | 'rejoin' | 'active'
diff --git a/src/pages/verify-email/VerifyEmailPage.vue b/src/pages/verify-email/VerifyEmailPage.vue
new file mode 100644
index 0000000..86bfdd8
--- /dev/null
+++ b/src/pages/verify-email/VerifyEmailPage.vue
@@ -0,0 +1,52 @@
+<script setup lang="ts">
+import { parseRedirectQuery } from '@/composable/parseRouteQuery'
+import { useVerifiedEmailStore } from '@/stores/verifiedEmail'
+import { storeToRefs } from 'pinia'
+import { onMounted, ref } from 'vue'
+import { useRoute, useRouter } from 'vue-router'
+
+const route = useRoute()
+const router = useRouter()
+const verifiedEmailStore = useVerifiedEmailStore()
+const { hasVerifiedEmail } = storeToRefs(verifiedEmailStore)
+const { setVerifiedEmail } = verifiedEmailStore
+
+const redirectTo = parseRedirectQuery(route.query.redirect)
+
+const emailInput = ref('')
+
+const handleVerifyEmail = () => {
+  // ここで実際のメール送信と検証プロセスをシミュレートします。
+  // 簡単のため、入力されたメールアドレスを検証済みとして扱います。
+  if (emailInput.value && emailInput.value.endsWith('@isct.ac.jp')) {
+    setVerifiedEmail(emailInput.value)
+    router.push(redirectTo)
+  } else {
+    alert('有効な大学のメールアドレス (isct.ac.jp) を入力してください。')
+  }
+}
+
+const redirectIfVerifiedEmailExists = () => {
+  if (hasVerifiedEmail.value) {
+    router.push(redirectTo)
+  }
+}
+
+onMounted(redirectIfVerifiedEmailExists)
+</script>
+
+<template>
+  <div v-if="!hasVerifiedEmail">
+    <h1>メールアドレス認証</h1>
+    <p>大学のメールアドレス (isct.ac.jp) を入力してください。</p>
+    <p>メールを送信し、メールアドレスの所有者であることを確認します。(現在はダミー実装です)</p>
+    <div>
+      <label for="email">メールアドレス:</label>
+      <input type="email" id="email" v-model="emailInput" placeholder="example@isct.ac.jp" />
+    </div>
+    <button @click="handleVerifyEmail">認証メールを送信する</button>
+  </div>
+  <div v-else>
+    <p>メールアドレスは既に認証済みです。リダイレクトしています...</p>
+  </div>
+</template>
diff --git a/src/router/index.ts b/src/router/index.ts
index 6cedfaa..8172189 100644
--- a/src/router/index.ts
+++ b/src/router/index.ts
@@ -17,6 +17,16 @@ const router = createRouter({
       // which is lazy-loaded when the route is visited.
       component: () => import('@/pages/membership/MembershipPage.vue'),
     },
+    {
+      path: '/verify-email',
+      name: 'verify-email',
+      component: () => import('@/pages/verify-email/VerifyEmailPage.vue'),
+    },
+    {
+      path: '/login',
+      name: 'login',
+      component: () => import('@/pages/login/LoginPage.vue'),
+    },
   ],
 })
 
diff --git a/src/stores/auth.ts b/src/stores/auth.ts
new file mode 100644
index 0000000..6797a1d
--- /dev/null
+++ b/src/stores/auth.ts
@@ -0,0 +1,19 @@
+import { defineStore } from 'pinia'
+import { computed, readonly, ref } from 'vue'
+
+export const useAuthStore = defineStore('auth', () => {
+  const _loggedInTraqId = ref<{ traqId: string } | null>(null)
+
+  const loggedInTraqId = readonly(_loggedInTraqId)
+  const isLoggedIn = computed(() => _loggedInTraqId.value !== null)
+
+  const login = (traqId: string) => {
+    _loggedInTraqId.value = { traqId }
+  }
+
+  const logout = () => {
+    _loggedInTraqId.value = null
+  }
+
+  return { isLoggedIn, loggedInTraqId, login, logout }
+})
diff --git a/src/stores/counter.ts b/src/stores/counter.ts
deleted file mode 100644
index b6757ba..0000000
--- a/src/stores/counter.ts
+++ /dev/null
@@ -1,12 +0,0 @@
-import { ref, computed } from 'vue'
-import { defineStore } from 'pinia'
-
-export const useCounterStore = defineStore('counter', () => {
-  const count = ref(0)
-  const doubleCount = computed(() => count.value * 2)
-  function increment() {
-    count.value++
-  }
-
-  return { count, doubleCount, increment }
-})
diff --git a/src/stores/verifiedEmail.ts b/src/stores/verifiedEmail.ts
new file mode 100644
index 0000000..27628e5
--- /dev/null
+++ b/src/stores/verifiedEmail.ts
@@ -0,0 +1,19 @@
+import { defineStore } from 'pinia'
+import { computed, readonly, ref } from 'vue'
+
+export const useVerifiedEmailStore = defineStore('verifiedEmail', () => {
+  const _verifiedEmail = ref<string | null>(null)
+
+  const verifiedEmail = readonly(_verifiedEmail)
+  const hasVerifiedEmail = computed(() => _verifiedEmail.value !== null)
+
+  const setVerifiedEmail = (verifiedEmail: string) => {
+    _verifiedEmail.value = verifiedEmail
+  }
+
+  const clearEmail = () => {
+    _verifiedEmail.value = null
+  }
+
+  return { verifiedEmail, hasVerifiedEmail, setVerifiedEmail, clearEmail }
+})