About Japanese sort order

• Hiragana and katakana are sorted in the order of the kana syllabary.
• English letters are sorted alphabetically. No distinction is made between uppercase and lowercase letters.
• Numbers are sorted in descending order.
• No distinction is made between half-pitch and full-pitch English characters and symbols.
• Repetition marks "" are treated the same as the character preceding the mark. For example, "" is treated as "".
• Other kanji, symbols, and so on are sorted in the order of their Shift-JIS codes.

The rules are applied in this order:

1. No distinction is made between hiragana, full-pitch katakana, and half-pitch katakana.
2. Voiced sounds, semi-voiced sounds, double consonants, and contracted sounds are treated as unvoiced sounds. Long vowel sounds () are treated as the vowel of the previous syllable. For example:
   • Voiced sound: ->
   • Semi-voiced sound: ->
   • Double consonant: ->
   • Contracted sound: ->
   • Long-vowel sound: ->
3. Voiced and unvoiced sounds are sorted in the following order: unvoiced sound, voiced sound, semi-voiced sound. Previous sounds have priority.
   Example: -> ->
4. Double consonants and contracted sounds are placed in front of unvoiced sounds. Previous sounds have priority.
   Example: ->