diff --git a/backend/.env.example b/backend/.env.example
index 340b207b..e0150aa9 100644
--- a/backend/.env.example
+++ b/backend/.env.example
@@ -1,4 +1,4 @@
-APP_NAME=KIKIkan
+APP_NAME=KIKI
 APP_ENV=local
 APP_KEY=
 APP_DEBUG=true
diff --git a/backend/.env.release b/backend/.env.release
index 340b207b..e0150aa9 100644
--- a/backend/.env.release
+++ b/backend/.env.release
@@ -1,4 +1,4 @@
-APP_NAME=KIKIkan
+APP_NAME=KIKI
 APP_ENV=local
 APP_KEY=
 APP_DEBUG=true
diff --git a/backend/app/Mail/FathersRegistrationTemporaryMail.php b/backend/app/Mail/FathersRegistrationTemporaryMail.php
index 5a12c259..696c81a1 100644
--- a/backend/app/Mail/FathersRegistrationTemporaryMail.php
+++ b/backend/app/Mail/FathersRegistrationTemporaryMail.php
@@ -16,7 +16,7 @@ class FathersRegistrationTemporaryMail extends Mailable {
     }
 
     public function build () {
-        return $this->subject('【KIKIkan】会員登録のご案内')->markdown('emails.fathers.registration.temporary', [
+        return $this->subject('【KIKI】会員登録のご案内')->markdown('emails.fathers.registration.temporary', [
             'token' => $this->token
         ]);
     }
diff --git a/backend/resources/views/emails/fathers/registration/temporary.blade.php b/backend/resources/views/emails/fathers/registration/temporary.blade.php
index 0d1b0827..4331452e 100644
--- a/backend/resources/views/emails/fathers/registration/temporary.blade.php
+++ b/backend/resources/views/emails/fathers/registration/temporary.blade.php
@@ -1,9 +1,9 @@
 @component('mail::message')
-# 【KIKIkan】会員登録のご案内
+# 【KIKI】会員登録のご案内
 
-KIKIkanサービスの会員登録のご案内です。
+KIKIサービスの会員登録のご案内です。
 
-KIKIkanシステムのご利用ありがとうございます。
+KIKIシステムのご利用ありがとうございます。
 
 ※本登録完了後にホーム画面もしくはブックマークに登録してください。<br />
 ログインする際に利用します。
@@ -22,7 +22,7 @@ URLの有効期限を過ぎると、再登録が必要になりますので、
 
 ■□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□□■
 
-KIKIkan運営事務局<br />
+KIKI運営事務局<br />
 56@zotman.jp<br />
 {{ url('/') }}/
 
diff --git a/backend/resources/views/vendor/mail/html/header.blade.php b/backend/resources/views/vendor/mail/html/header.blade.php
index ed61a133..6276d9ea 100755
--- a/backend/resources/views/vendor/mail/html/header.blade.php
+++ b/backend/resources/views/vendor/mail/html/header.blade.php
@@ -1,7 +1,7 @@
 <tr>
 <td class="header">
 <a href="{{ $url }}" style="display: inline-block;">
-<img src="{{ $url }}/assets/img/common/logo.png" class="logo" alt="KIKIkan">
+<img src="{{ $url }}/assets/img/common/logo.png" class="logo" alt="KIKI">
 </a>
 </td>
 </tr>