Natsume Airi (Anzai Kyoko) works part-time as a tutor for the son of her husband's colleague, Ooki. One evening, after finishing her tutoring session, Kyoko witnesses Ooki and his mistress engaged in lewd acts. Several days later, Kyoko is raped by Ooki after he drugs her drink with sleeping pills. Under threat, Kyoko has no choice but to undergo training. Humiliation, shame, and pleasure intertwine. Driven by jealousy towards Ooki's mistress, Kyoko develops a taste for masochistic pleasure.
