A married woman, Hitomi, lives with her son while her husband is on a business trip. One day, she is caught masturbating by her son's friend who came to study overnight. She is coerced into having sex with him. The young friends take advantage of her when her son isn't looking, playing with her body, making her climax, and committing adultery. Then... Hitomi's body becomes intoxicated with long-forgotten pleasure...
