In 1864 Japan, a young woman called Chizuru Yukimura is looking for her absent father, Koudou, a doctor whose business sometimes takes him away from home. But, after months of silence, Chizuru disguises herself as a male and travels to Kyoto in pursuit of him. She tries to hide after attracting the notice of a ronin and ends up witnessing a horrible sight: the ronin being mercilessly slaughtered by frenzied white-haired guys. In an unexpected turn of events, Shinsengumi members arrive to slay the beasts. But Chizuru's protection is short-lived, as this group of guys ties her up and takes her back to their headquarters, undecided whether to let her live or forever silence her.