Rick, a down-and-out American boxer, is hired to transport a sword to Japan, unaware that the whole thing is a set up in a bitter blood-feud between two brothers, one who follows the traditional path of the samurai and the other a businessman. At the behest of the businessman, Rick undertakes samurai training from the other brother, but joins his cause. He also becomes romantically involved with the samurai's daughter. 　　译文(2): 里克，一个落魄的美国拳击手，被雇佣运送一把剑到日本，他不知道整件事是一个陷阱，在两个兄弟之间的血海深仇，一个遵循传统的武士道路，另一个是商人。在商人的要求下，里克接受了另一个兄弟的武士训练，但加入了他的事业。他还与武士的女儿发生了恋爱关系。