Years before the events of Hakuouki, the Shinsengumi did not yet exist by that name — they were the Mibu Roushigumi, newly arrived in Kyoto. Ibuki Ryuunosuke is a wandering young man who falls in with the group almost by accident at the moment of their arrival. While grudgingly building relationships with the members around him, he witnesses the earliest days of what the Shinsengumi will become.