In this adult school role-play, classmate Aya Onaumi is a striking beauty who keeps to herself. One day after class, she discovers the narrator's weakness and gains the power to make him obey. When she summons him to her home, he finds her transformed by an immaculate cosplay outfit. Aya reveals that she has an intense sex drive and especially enjoys taking control of quiet, passive adult men like him and pleasuring them however she wants. That afternoon begins their unusual secret relationship.