Yukio stays at his brother’s home during job training and grows obsessed with Ai, his brother’s wife, who casually walks around in a tank top and thong. One day he finds her napping defenselessly and attacks her in a non-consensual role-play scene. Ai initially resists, but his relentless machine-gun pounding from behind makes her lose bladder control and convulse through an orgasm, turning the encounter into humiliating NTR betrayal.