Warm water under a Red Bridge

Yosuke, an unemployed salaryman, travels to a small fishing port in search of a treasure hidden 50 years ago. There, he meets Saeko, a beautiful young woman who has a strange physiological reaction when she orgasms. They begin a passionate affair, Yosuke struggling to satisfy her amorous desires. Rumours abound, however, about the fate of her last boyfriend, who drowned in mysterious circumstances.