Yuri Sato is kidnapped by a secret organization conducting lewd human anatomy experiments, drawn into their world amid fear and anxiety. As she trembles in terror at the men before her, she desperately resists—yet when an electric vibrator is relentlessly applied over her underwear, her pure, innocent body begins to react sensitively. Her resistance grows weaker as unbearable sensations take over. Gradually, from top to bottom, her most intimate areas are exposed. Roughly handled like a toy, her mind and body slowly transform into something lewd and depraved. This transformation goes beyond mere physical change, deeply affecting her inner self. Amid her fear, she begins to gradually realize how her body and soul are changing.