Kyoko Anzai (Natsume Airi) works part-time as a private tutor for the son of her husband's colleague (Oki). One evening, Kyoko, who finished her tutoring, witnessed Oki and her mistress doing indecent acts. A few days later, Kyoko is raped by Oki, who has put sleeping pills in her husband's sake. Kyoko has no choice but to be threatened and trained by her. She is humiliated, embarrassed and pleasant. Kyoko develops the pleasure of her masochism with her jealousy of her mistress of Oki.
