A solitary woman finds herself among the ranks of the Shinsengumi, the legendary samurai militia of 19th-century Japan, and her presence sets off a chain of unforeseen consequences. The narrative weaves through pivotal historical moments of the faction's turbulent era, including confrontations with sumo wrestlers in Osaka, the elimination of a key rival leader, and the notorious assault on the Ikeda-ya inn, challenging players to navigate how her involvement shapes these fateful events.