Kira Kozukenosuke is slashed with a sword by Daimyo Ako, who holds deep contempt towards Kira Kozukenosuke. Daimyo Ako then kills himself. Both of their families now fall into a big crisis. At this time, a vassal for the Kira family comes up with an extraordinary solution. The plan calls for Kira Takaaki, who is the younger brother of Kozukenosuke Kira, to pretend he is his older brother and deceive the shogunate. Kira Takaaki looks virtually identical to his older brother.