Aya Ariyoshi plays Rie, an amateur pregnant woman who has lived purely, knowing no man other than her husband. Her first affair exposes her hidden masochistic nature, leading to intense restraint and vigorous standing intercourse. Even as her body convulses, she repeatedly reaches orgasm. Summoned again, she undergoes strict discipline with whipping, ultimately swearing absolute obedience. The clash between her innocent heart and the tension of her first infidelity creates a thrilling, pulse-pounding experience.