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Kozukenosuke Kira is slashed with a sword by Ako Daimyo, who holds deep contempt towards Kozukenosuke Kira. Ako Daimyo 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 Takaaki Kira, who is the younger brother of Kozukenosuke Kira, to pretend he is his older brother and deceive the shogunate. Takaaki Kira looks virtually identical to his older brother.