Ready to quit their life of crime, the three "most-wanted" outlaws in the West---Butch Cassidy, Sundance Kid and Bill Carver ---perform their final job by robbing and stealing a train and fleeing across the border. In a South American town they begin their life of respectability by purchasing a ranch and depositing their stolen fortune in the local bank, and throwing a big fiesta to entertain the locals, including Colonel Aguilar and his beautiful daughter Rita.

Shiba, a wandering ronin, encounters a band of peasants who have kidnapped the daughter of their dictatorial magistrate, in hopes of coercing from him a reduction in taxes. Shiba takes up their fight, joined by two renegades from the magistrate's guard, Sakura and Kikyo. The three outlaws find themselves in a battle to the death.