Matoba Kokingo, who once served as a retainer for a hatamoto, becomes disillusioned with his master and elopes with his lover, Oyuki. They flee their lord's household, taking with them 30 ryō of official funds. However, the money is stolen from them at an inn, and shortly after, Oyuki dies of illness. Eight years later, Kokingo has fallen into disgrace, now making a living as a ronin who specializes in extortion. One day, he attempts to extort a restaurant owner named Hanzo, only to discover that Hanzo was the very thief who stole the 30 ryō from him eight years ago…

Film directed by Kenji Misumi

Klima, Deputy Minister of Industry of the Republic of Alabanda, has come to Japan to purchase materials for the water dam construction. Kitami, who called himself a salesman and met with Klima, acts as his bodyguard. However, Kitami learns that a large number of industrial cylinders unrelated to dam construction have been purchased, and Klima secretly confined her secretary, a former army colonel, and threatened to produce poisonous gas. Klima packed the gas in a cylinder and sent it to Alabanda in an attempt to cause a civil war between the government and the tribes. Around that time, Klima secretly investigated Kitami's identity and learned that he was a secret agent.