A live-action adaptation of Konoshiro Shinko's popular cool-dominant story, presented as adult classroom role-play. Mamiya, the class beauty who seemed completely innocent, suddenly flashes her breasts during a lesson. When they are alone after class, she becomes even bolder, giving him a handjob while kissing him deeply. The next day she presses her body against him until he cannot stay soft or hold onto his self-control, and the two finally have sex.