Teacher Rina discovers her student Ryuji smoking, and reprimands him on the spot before summoning him to her home. However, Ryuji's mother, Misa, runs a soapland and lures Rina into a trap, kidnapping her and forcing her into confinement. Misa begins training Rina to become a soapland prostitute, turning her into a sex slave. The story follows Rina's struggle to escape, the humiliation she endures, and the psychological torment she experiences as she is systematically broken down and transformed into a mere cumdump.