A college music student, Rei Kuroshima, who masturbates 14 times a week, is given a one-month strict abstinence order. After a few days of abstinence, her body starts to react abnormally. A month later, her body becomes so sensitive that it feels like it will break with just a touch. When a penis is inserted, she experiences intense orgasms with copious amounts of lubrication and violent convulsions. She reaches a level of pleasure she's never felt before, collapsing into a dazed state. The music student's mental state deteriorates, and she starts to hear hallucinations. This is what truly pleasurable sex feels like for Rei Kuroshima.