Teacher Mika, who teaches at a prestigious private school, is kidnapped and imprisoned by the underground sex organization NEOBLACK. Her torture involves degrading training and extreme humiliation, culminating in the ultimate punishment: becoming an anal flesh toilet, forced to immediately drink her own urine. Subjected to relentless anal conditioning, Mika endures agonizing torment until she finally awakens. She reaches climax during a threesome where her anus, pussy, and mouth are penetrated simultaneously. Recognizing her potential, she is invited to NEOBLACK's exclusive flesh toilet party festival attended by 50 members, where she indulges in mass piss drinking, urine bathing, golden showers, and deep-throating.