Misako Hayase (Mako Oda), who works part-time at a supermarket, is an ordinary housewife who lives with her son Satoshi and her honest husband. However, one day, at a drinking party with her employer, she is invited by a young part-time worker, Kuroki, and makes a mistake of a one-night stand. Misako feels guilty but also feels the joy of being a woman, and once again has sex with Kuroki, becoming addicted to an intense sexual encounter. Just then, Mamiya (Kaori Otonashi), a part-time coworker who has become addicted to carnal desires with Kuroki and has shaved her pubic hair as a sign of submission, appears in front of Misako...