diff --git a/404.html b/404.html
index aaea0878..73b29b7a 100644
--- a/404.html
+++ b/404.html
@@ -1,14 +1,14 @@
 ---
 permalink: /404.html
 layout: default
-hero_title: "ページが見つかりません"
-hero_subtitle: "404 Not Found"
+title: "ページが見つかりません"
+subtitle: "404 Not Found"
 ---
 
 <!-- TODO: include navbar.html -->
 
 <div class="text-center my-40 mx-8 xl:my-20">
-  <h2 class="text-5xl">Page Not Found</h1>
+  <h2 class="text-5xl">Page Not Found</h2>
 
   <p class="my-8">
     <strong>お探しのページが見つかりませんでした🥹</strong><br />
diff --git a/_archives/apply.md b/_archives/apply.md
index d6653046..4d364205 100644
--- a/_archives/apply.md
+++ b/_archives/apply.md
@@ -1,7 +1,7 @@
 ---
 layout: default
-hero_title: "応募"
-hero_subtitle: "APPLY"
+title: "応募"
+subtitle: "APPLY"
 permalink: /apply/
 ---
 
diff --git a/_layouts/default.html b/_layouts/default.html
index 7727c7ba..6d30021e 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -7,8 +7,8 @@
     <main class="flex-grow">
       <header class="hero">
         <div class="hero-container">
-          <h1 class="hero-title">{{ page.hero_title }}</h1>
-          <p class="hero-subtitle">{{ page.hero_subtitle }}</p>
+          <h1 class="hero-title">{{ page.hero_title | default: page.title }}</h1>
+          <p class="hero-subtitle">{{ page.hero_subtitle | default: page.subtitle }}</p>
         </div>
       </header>
       {{ content }}
diff --git a/about.md b/about.md
index 92bf051e..ff5c36bf 100644
--- a/about.md
+++ b/about.md
@@ -1,7 +1,7 @@
 ---
 layout: default
-hero_title: "開催概要"
-hero_subtitle: "ABOUT"
+title: "開催概要"
+subtitle: "ABOUT"
 ---
 
 <!-- コンテンツエリア -->
diff --git a/conduct.md b/conduct.md
index 668ec9e0..84c4aafc 100644
--- a/conduct.md
+++ b/conduct.md
@@ -1,7 +1,7 @@
 ---
 layout: default
-hero_title: "行動規範"
-hero_subtitle: "Code of Conduct"
+title: "行動規範"
+subtitle: "Code of Conduct"
 ---
 
 <!-- コンテンツエリア -->
diff --git a/contact.md b/contact.md
index 2437aaac..23f921fd 100644
--- a/contact.md
+++ b/contact.md
@@ -1,7 +1,7 @@
 ---
 layout: default
-hero_title: "お問い合わせ"
-hero_subtitle: "CONTACT"
+title: "お問い合わせ"
+subtitle: "CONTACT"
 ---
 
 <!-- コンテンツエリア -->
diff --git a/display-rules.md b/display-rules.md
index 1d18ca0c..946ba1e1 100644
--- a/display-rules.md
+++ b/display-rules.md
@@ -1,7 +1,7 @@
 ---
 layout: default
-hero_title: "展示のおやくそく"
-hero_subtitle: "DISPLAY RULES"
+title: "展示のおやくそく"
+subtitle: "DISPLAY RULES"
 ---
 
 <!-- コンテンツエリア -->
diff --git a/events.md b/events.md
index 097961ca..d06f5979 100644
--- a/events.md
+++ b/events.md
@@ -1,7 +1,7 @@
 ---
 layout: default
-hero_title: "来場応募"
-hero_subtitle: "EVENTS"
+title: "来場応募"
+subtitle: "EVENTS"
 ---
 
 <div class="bg-white py-16 px-4">
diff --git a/news.md b/news.md
index c297fa99..94068fdd 100644
--- a/news.md
+++ b/news.md
@@ -1,7 +1,7 @@
 ---
 layout: default
-hero_title: "お知らせ"
-hero_subtitle: "NEWS"
+title: "お知らせ"
+subtitle: "NEWS"
 ---
 
 <div class="bg-white py-16 px-4">
diff --git a/privacy.md b/privacy.md
index 0e797cb7..b446751c 100644
--- a/privacy.md
+++ b/privacy.md
@@ -1,7 +1,7 @@
 ---
 layout: default
-hero_title: "プライバシーポリシー"
-hero_subtitle: "PRIVACY POLICY"
+title: "プライバシーポリシー"
+subtitle: "PRIVACY POLICY"
 redirect_from:
   - /privacy-policy/
 ---
diff --git a/register.md b/register.md
index f59d928c..9bdda15c 100644
--- a/register.md
+++ b/register.md
@@ -1,7 +1,7 @@
 ---
 layout: default
-hero_title: "来場応募する"
-hero_subtitle: "Registration"
+title: "来場応募する"
+subtitle: "Registration"
 redirect_from:
   - /registration/
 ---
diff --git a/sponsor-smartone.md b/sponsor-smartone.md
new file mode 100644
index 00000000..625b62b6
--- /dev/null
+++ b/sponsor-smartone.md
@@ -0,0 +1,17 @@
+---
+layout: default
+title: "株式会社SmartOne"
+subtitle: "Gold Sponsor"
+---
+
+<img src="/img/contests/sponsor-logos/smartone.svg" alt="SmartOne-Logo" class="pt-12 pb-12 mx-auto mb-8 max-h-100">
+
+<a class="button-push block mx-auto w-fit my-8" href="https://cafe-bar.starrobox.com/" target="_blank" rel="noopener noreferrer">公式ホームページを見る</a>
+
+<div class="md-container">
+    <div class="md-body">
+        株式会社SmartOneは、ロボットによる自動化・開発、CADスクール運営、そしてロボットショールームとして「ロボットカフェバー」を運営しています。
+        <br>最新ロボット技術を体験できる場を提供し、未来の技術者育成と地域振興に貢献します。
+        <br>子どもたちの夢と挑戦を支援し、地域の未来を共に創造していきたいと考えています。
+    </div>
+</div>
\ No newline at end of file
diff --git a/sponsors.md b/sponsors.md
index 316565d2..df352dd5 100644
--- a/sponsors.md
+++ b/sponsors.md
@@ -1,7 +1,7 @@
 ---
 layout: default
-hero_title: "スポンサー"
-hero_subtitle: "COOLEST PARTNERS"
+title: "スポンサー"
+subtitle: "COOLEST PARTNERS"
 ---
 
 <!-- コンテンツエリア -->
diff --git a/staff.md b/staff.md
index 249edcb0..990319be 100644
--- a/staff.md
+++ b/staff.md
@@ -1,7 +1,7 @@
 ---
 layout: default
-hero_title: "運営に参加する"
-hero_subtitle: "join us"
+title: "運営に参加する"
+subtitle: "join us"
 ---
 
 <div class="bg-white py-16 px-4">
diff --git a/travel-support.md b/travel-support.md
index 85842e80..615688f5 100644
--- a/travel-support.md
+++ b/travel-support.md
@@ -1,7 +1,7 @@
 ---
 layout: default
-hero_title: "交通費補助"
-hero_subtitle: "TRAVEL SUPPORT"
+title: "交通費補助"
+subtitle: "TRAVEL SUPPORT"
 ---
 
 <!-- コンテンツエリア -->