Ichi (which is the main character's name, Zato being the lowest rank in the Todoza) is attacked by a young yakuza man he has never met. The man is despatched and tells Ichi that he did it to get ten ryo reward for his mother. Ichi travels to the mother's town and enters a local sumo match and defeats several sighted opponents. While Maki, the young man's mother, accepts Ichi as honorable for confessing to the death, the opponents, part of a local Yakuza gang, seek to reclaim their honor by claiming Ichi's life.