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A sober girl, almost a virgin, wakes up to sex and then dies from it.
"So many nipples, so many times... is sex really this much?" Mayu, a simple office worker in her twenties who has only had sex once, is introduced to her sister's fiancé, Tatsuro, by her sister Maho. However, she accidentally sees Tatsuro cheating on her with another woman...? Mayu calls Tatsuro to question him for her sister's sake. Tatsuro confesses that he is a sex addict...? Mayu can't leave the distressed Tatsuro alone, so she takes him home. Tatsuro tearfully reveals the pain of his addiction and asks for Mayu's body. Tatsuro's caresses escalate as Mayu is unable to refuse, and Mayu's body becomes hotter and hotter as she experiences gentle caresses for the first time...! "What is this...? I've never done this before...I’m cumming… I’m cumming…!!"