Anzu won a hot spring trip in the shopping street lottery. She and her son Yo-suke, who works in Tokyo, secretly came on the trip without telling her husband. Anzu is considering divorce because her husband has been cheating on her. Actually, she wanted to sort out various troubles in her mind during this trip… Her son was shocked when she confided in him… This became the trigger for her son to realize his romantic feelings for his mother that he had hidden since childhood. He began to desire his mother as a woman… Meanwhile, Anzu, who had wounds in her heart, sought her son's body to fill her loneliness…
