Akiyoshi

Akiyoshi was captured by the Shinsengumi during the Ikedaya Incident. While the Shinsengumi is preoccupied, Katsura is released by the owner of the Ikedaya and returns to Choshuu headquarters with a story of a "demon" fighting among the Shinsengumi (actually Tominaga Sei, who became unstoppable after believing that Okita Souji had been killed).

In the coming weeks, Akiyoshi begins killing off members of the Shinsengumi in hopes of killing the "demon" he saw. When he finally finds Sei, he tells her he hasn't been able to sleep since that night. The voices in his head keep telling him to "kill the demon".

Souji comes to Sei's rescue, quickly killing Akiyoshi and finally freeing him of the demons that were inside his head.