When Sokichi stops providing his long-time lover Kikuyo enough money to pay for the care of their three young children, Kikuyo leaves the children with Sokichi - and his very surprised and angry wife Oume - and disappears.

A car going at 25 mph plunges into the sea at Shinko Harbour, Toyama prefecture. Inside is the local business magnate Fukutaro Shirakawa, who perishes. Riding alongside him and surviving unhurt is his second wife, Kumako. It soon comes to light that Kumako’s husband was insured for 300 million yen and she is arrested on suspicion of murdering her husband for the insurance money. The newspapers denounce her as an evil woman, while the public is in no doubt about Kumako’s crime. Ritsuko Sahara is chosen as her defence attorney but the pair clash over almost everything...