When word arrives that the renowned assassin Sakamoto Ryoma is active again, the Shinsengumi must come up with a plan to stop him. Sei, still undercover as the male warrior Kamiya Seizaburo, tries to persuade her superiors that he's not the threat they believe him to be, but to no avail. Will she take matters into her own hands, despite the risk to herself and her troop? For older teen audiences.