Schoolgirls Riku and Natsuki fall into a trap, get kidnapped and confined, then subjected to brutal, humiliating training under the guise of discipline—ultimately being plunged into relentless sex. A merciless series of depraved training unfolds to satisfy the man's dark desires: forced obedience through irrumation, intense forced orgasms with a vibrator, and even double penetration using their own flesh. Completely dominated, they gradually lose themselves to total submission.