Sanae is a full-time housewife with a 10-year-old son. She had promised herself never to cheat, yet she finds herself inviting a stranger into her home. Burdened with pent-up desire, her F-cup body is incredibly sensitive—her nipples twitch at the slightest touch. In the secrecy of her marital bedroom, she writhes passionately in taboo ecstasy, growing more aroused by the transgression. The fear of her husband returning at any moment only intensifies her arousal.