Risa's husband works as a researcher at a pharmaceutical company, but he caused significant financial damage to the company. To compensate, Risa is forced to participate in an experiment led by Ichijo, the company's chief researcher. The experiment aims to drastically enhance human sexual desire, destroy rational thought, and allow complete control over the subject. Though Risa resists mentally, she cannot overcome the effects of the aphrodisiac drugs—her body obeys every command. Even as she's forced into humiliating acts, her mind protests while her body instinctively chases pleasure. Torn between shame and ecstasy, Risa gradually loses herself.