Handcuffed and kidnapped by a strange man, the flat-chested girl 【Ruru Cha】 is trapped in a cruel world where she's been forced to adapt to satisfying men's desires against her will. When she asks for a drink, she's urinated on. Numb and lifeless, she's made to masturbate with a vibrator until she squirts and collapses. Accustomed to a system where fulfilling the man's wishes earns her rewards, she pleads, "I'll suck you off, please give me some food," and hungrily devours his cock. Transformed into nothing more than an obedient flesh toilet for sexual release, she simply follows her master's commands. Tragically, as her training progresses, she begins to feel excitement from receiving cum facials, stepping deeper into an endless world as a cumdump, ultimately giving up any hope of returning to her former life.