diff --git a/src/kana_transliteration.rs b/src/kana_transliteration.rs
index cee73d6..325657c 100644
--- a/src/kana_transliteration.rs
+++ b/src/kana_transliteration.rs
@@ -24,7 +24,7 @@ fn hiragana_vowel_map(hiragana: char) -> Option<char> {
     match hiragana {
         'あ' | 'ぁ' => Some('あ'),
         'い' | 'ぃ' => Some('い'),
-        'う' | 'ぅ' => Some('う'),
+        'う' | 'ゔ' | 'ぅ' => Some('う'),
         'え' | 'ぇ' => Some('え'),
         'お' | 'ぉ' => Some('お'),
         'か' | 'が' => Some('あ'),
@@ -65,10 +65,11 @@ fn hiragana_vowel_map(hiragana: char) -> Option<char> {
         'る' => Some('う'),
         'れ' => Some('え'),
         'ろ' => Some('お'),
-        'わ' => Some('あ'),
+        'わ' | 'ゎ' => Some('あ'),
         'ゐ' => Some('い'),
         'ゑ' => Some('え'),
         'を' => Some('お'),
+        'ん' => Some('ん'),
         _ => None,
     }
 }
@@ -77,7 +78,7 @@ fn katakana_vowel_map(katakana: char) -> Option<char> {
     match katakana {
         'ア' | 'ァ' => Some('ア'),
         'イ' | 'ィ' => Some('イ'),
-        'ウ' | 'ゥ' => Some('ウ'),
+        'ウ' | 'ヴ' | 'ゥ' => Some('ウ'),
         'エ' | 'ェ' => Some('エ'),
         'オ' | 'ォ' => Some('オ'),
         'カ' | 'ガ' => Some('ア'),
@@ -118,10 +119,11 @@ fn katakana_vowel_map(katakana: char) -> Option<char> {
         'ル' => Some('ウ'),
         'レ' => Some('エ'),
         'ロ' => Some('オ'),
-        'ワ' => Some('ア'),
+        'ワ' | 'ヮ' => Some('ア'),
         'ヰ' => Some('イ'),
         'ヱ' => Some('エ'),
         'ヲ' => Some('オ'),
+        'ン' => Some('ン'),
         _ => None,
     }
 }