Okada Izō is a
rōnin born into poverty who joins the , a group of Imperial loyalists based in
Tosa and headed by
Takechi Hanpeita. Izō soon becomes a well known and successful killer, and he is stubbornly loyal to Hanpeita. However,
Sakamoto Ryōma warns him that he is merely "Takechi's dog" and that Hanpeita will end up betraying him. After Izō fouls a night attack by the Kinnō-Tō on
Ishibe Station by revealing his identity, Hanpeita's wrath at his blunder and resentment at his own subordinacy begins to test Izō's loyalty. Eventually abandoning Hanpeita, the regretful Izō returns and apologizes. He is then ordered to assassinate the aristocrat outside the
Sarugatsuji using the sword of
Tanaka Shinbei. During his interrogation over Anegakōji's death, Tanaka commits
harakiri after his recovered sword is presented to him as evidence. As Hanpeita becomes increasingly determined to succeed in his plan to become daimyo of Tosa by eliminating his opponents, it becomes necessary to sacrifice Izō, which he does by betraying him after he is arrested as a rōnin by the
Aizu Mimawarigumi and later by trying to poison him with
amygdalin-drugged sake (座枯らし). Izō survives, but, disillusioned, confesses to his murders for the Kinnō-Tō, and is condemned to
crucifixion. Before being killed, he is told that Hanpeita will be forced to commit harakiri. ==Cast==