diff --git a/dyesub-tool/src/key/mod.rs b/dyesub-tool/src/key/mod.rs
index 52f710f..6a10d6b 100644
--- a/dyesub-tool/src/key/mod.rs
+++ b/dyesub-tool/src/key/mod.rs
@@ -3,26 +3,20 @@ pub use oyayubi::OYAYUBI;
 
 use std::fmt::{Display, self};
 
-pub struct Key {
-    pub latin: char,
-    pub normal: char,
-    pub shift: char,
-    pub alt_shift: Option<char>,
+pub enum Key {
+    Oyayubi {
+        latin: char,
+        normal: char,
+        shift: char,
+        alt_shift: Option<char>,
+    }
 }
 
 impl Display for Key {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "{}", self.latin)
-    }
-}
-
-impl Key {
-    const fn new(latin: char, normal: char, shift: char, alt_shift: Option<char>) -> Self {
-        Self {
-            latin,
-            normal,
-            shift,
-            alt_shift,
-        }
+        use Key::*;
+        write!(f, "{}", match self {
+            Oyayubi { latin, .. } => latin,
+        })
     }
 }
\ No newline at end of file
diff --git a/dyesub-tool/src/key/oyayubi.rs b/dyesub-tool/src/key/oyayubi.rs
index d94a77c..5bbac60 100644
--- a/dyesub-tool/src/key/oyayubi.rs
+++ b/dyesub-tool/src/key/oyayubi.rs
@@ -1,34 +1,43 @@
 use super::Key;
 
+const fn k(latin: char, normal: char, shift: char, alt_shift: Option<char>) -> Key {
+    Key::Oyayubi {
+        latin,
+        normal,
+        shift,
+        alt_shift,
+    }
+}
+
 pub const OYAYUBI: [Key; 30] = [
-    Key::new('Q', '。', 'ぁ', None),
-    Key::new('W', 'か', 'え', None),
-    Key::new('E', 'た', 'り', None),
-    Key::new('R', 'こ', 'ゃ', None),
-    Key::new('T', 'さ', 'れ', None),
-    Key::new('Y', 'ら', 'よ', Some('ぱ')),
-    Key::new('U', 'ち', 'に', None),
-    Key::new('I', 'く', 'る', None),
-    Key::new('O', 'つ', 'ま', None),
-    Key::new('P', '，', 'ぇ', Some('ぴ')),
-    Key::new('A', 'う', 'を', None),
-    Key::new('S', 'し', 'あ', None),
-    Key::new('D', 'て', 'な', None),
-    Key::new('F', 'け', 'ゅ', None),
-    Key::new('G', 'せ', 'も', None),
-    Key::new('H', 'は', 'み', None),
-    Key::new('J', 'と', 'お', None),
-    Key::new('K', 'き', 'の', None),
-    Key::new('L', 'い', 'ょ', Some('ぽ')),
-    Key::new(';', 'ん', 'っ', None), // Missing +
-    Key::new('Z', '．', 'ぅ', None),
-    Key::new('X', 'ひ', 'ー', None),
-    Key::new('C', 'す', 'ろ', None),
-    Key::new('V', 'ふ', 'や', None),
-    Key::new('B', 'へ', 'ぃ', None),
-    Key::new('N', 'め', 'ぬ', Some('ぷ')),
-    Key::new('M', 'そ', 'ゆ', None),
-    Key::new(',', 'ね', 'む', Some('ぺ')), // Missing <
-    Key::new('.', 'ほ', 'わ', None), // Missing >
-    Key::new('?', '・', 'ぉ', Some('ゎ')) // Missing /
+    k('Q', '。', 'ぁ', None),
+    k('W', 'か', 'え', None),
+    k('E', 'た', 'り', None),
+    k('R', 'こ', 'ゃ', None),
+    k('T', 'さ', 'れ', None),
+    k('Y', 'ら', 'よ', Some('ぱ')),
+    k('U', 'ち', 'に', None),
+    k('I', 'く', 'る', None),
+    k('O', 'つ', 'ま', None),
+    k('P', '，', 'ぇ', Some('ぴ')),
+    k('A', 'う', 'を', None),
+    k('S', 'し', 'あ', None),
+    k('D', 'て', 'な', None),
+    k('F', 'け', 'ゅ', None),
+    k('G', 'せ', 'も', None),
+    k('H', 'は', 'み', None),
+    k('J', 'と', 'お', None),
+    k('K', 'き', 'の', None),
+    k('L', 'い', 'ょ', Some('ぽ')),
+    k(';', 'ん', 'っ', None), // Missing +
+    k('Z', '．', 'ぅ', None),
+    k('X', 'ひ', 'ー', None),
+    k('C', 'す', 'ろ', None),
+    k('V', 'ふ', 'や', None),
+    k('B', 'へ', 'ぃ', None),
+    k('N', 'め', 'ぬ', Some('ぷ')),
+    k('M', 'そ', 'ゆ', None),
+    k(',', 'ね', 'む', Some('ぺ')), // Missing <
+    k('.', 'ほ', 'わ', None), // Missing >
+    k('?', '・', 'ぉ', Some('ゎ')) // Missing /
 ];
\ No newline at end of file
diff --git a/dyesub-tool/templates/document.xml b/dyesub-tool/templates/document.xml
index 7f7d4cb..a905954 100644
--- a/dyesub-tool/templates/document.xml
+++ b/dyesub-tool/templates/document.xml
@@ -6,17 +6,20 @@
   </defs>
   {% for (key, (x, y)) in positions %}
     <g x="{{ x }}" y="{{ y }}" transform="translate({{ x.to_user_units() }},{{ y.to_user_units() }})" width="{{ box_size }}" height="{{ box_size }}">
-      <rect width="{{ box_size }}" height="{{ box_size }}" fill="none" stroke="#cccccc" stroke-width="1pt" rx="2mm" />
-      {% let dy = "0.125em" %}
-      {% let font_size = "0.45cm" %}
-      {% let latin_font_size = "0.4cm" %}
-      {% let alt_shift_font_size = "0.325cm" %}
-      <text x="{{ box_size * 0.25 }}" y="{{ box_size * 0.25 }}" dominant-baseline="middle" text-anchor="middle" style="font-family: 'M PLUS Rounded 1c'" font-size="{{ latin_font_size }}" dy="{{ dy }}">{{ key.latin }}</text>
-      <text x="{{ box_size * 0.75 }}" y="{{ box_size * 0.25 }}" dominant-baseline="middle" text-anchor="middle" style="font-family: 'M PLUS Rounded 1c'" font-size="{{ font_size }}" dy="{{ dy }}">{{ key.shift }}</text>
-      <text x="{{ box_size * 0.75 }}" y="{{ box_size * 0.75 }}" dominant-baseline="middle" text-anchor="middle" style="font-family: 'M PLUS Rounded 1c'" font-size="{{ font_size }}" dy="{{ dy }}">{{ key.normal }}</text>
-      {% if let Some(alt_shift) = key.alt_shift %}
-      <text x="{{ box_size / 2.0 }}" y="{{ box_size / 2.0 }}" dominant-baseline="middle" text-anchor="middle" style="font-family: 'M PLUS Rounded 1c'" font-size="{{ alt_shift_font_size }}" dy="{{ dy }}">{{ alt_shift }}</text>
-      {% endif %}
+      {% match key %}
+        {% when crate::key::Key::Oyayubi with { latin, normal, shift, alt_shift } %}
+          <rect width="{{ box_size }}" height="{{ box_size }}" fill="none" stroke="#cccccc" stroke-width="1pt" rx="2mm" />
+          {% let dy = "0.125em" %}
+          {% let font_size = "0.45cm" %}
+          {% let latin_font_size = "0.4cm" %}
+          {% let alt_shift_font_size = "0.325cm" %}
+          <text x="{{ box_size * 0.25 }}" y="{{ box_size * 0.25 }}" dominant-baseline="middle" text-anchor="middle" style="font-family: 'M PLUS Rounded 1c'" font-size="{{ latin_font_size }}" dy="{{ dy }}">{{ latin }}</text>
+          <text x="{{ box_size * 0.75 }}" y="{{ box_size * 0.25 }}" dominant-baseline="middle" text-anchor="middle" style="font-family: 'M PLUS Rounded 1c'" font-size="{{ font_size }}" dy="{{ dy }}">{{ shift }}</text>
+          <text x="{{ box_size * 0.75 }}" y="{{ box_size * 0.75 }}" dominant-baseline="middle" text-anchor="middle" style="font-family: 'M PLUS Rounded 1c'" font-size="{{ font_size }}" dy="{{ dy }}">{{ normal }}</text>
+          {% if let Some(alt_shift) = alt_shift %}
+            <text x="{{ box_size / 2.0 }}" y="{{ box_size / 2.0 }}" dominant-baseline="middle" text-anchor="middle" style="font-family: 'M PLUS Rounded 1c'" font-size="{{ alt_shift_font_size }}" dy="{{ dy }}">{{ alt_shift }}</text>
+          {% endif %}
+      {% endmatch %}
     </g>
   {% endfor %}
 </svg>