Handsome young Katsuta tries to follow the yakuza code, but even his boss doesn't believe in it. Diamond Fuyu is less ethical, and allows the idiotic Tetsu to trick a schoolgirl he fancies, Hanako, into a type of bonded prostitution. Because of gang conflict, the Izu family (to whom Katsuta belongs) has their last gambling den taken over, and he seeks revenge. This brings him back into contact with a former lover who is also a card trickster - she is also Diamond Fuyu's sister, and is now married to Okaru-Hachi, who has mastered a clever card cheating trick called Okaru, which involves the deft use of mirrors.

In this Japanese drama, a dry goods merchant's daughter is surprised to discover that she has a twin sister. In rural Japan it was thought that twins bring bad luck, so the sister was abandoned at birth. Later her parents tell her that her sister was kidnapped. The woman doesn't believe this and when she eventually meets her twin, both women are involved in love affairs. The merchant's daughter is seeing an educated fellow. Trouble ensues when she begins suspecting that he may be more interested in her sister.

In the midst of an attempt to take over his company, a powerhouse executive is hit with a huge ransom demand when his chauffeur's son is kidnapped by mistake.

1963 film by Jindřich Polák