All Akai Katana Shin bosses

Times for each boss, if you want to fast-forward: 00:00 - Hiiragi 01:00 - Shumeigiku 02:50 - Shakugane 05:15 - War Fiend Hiiragi 08:03 - Nazuna 10:55 - Ayame & Ran 13:01 - Emperor Bashou