Shinji transfers to a new academy where he discovers he is the only boy. At first, he is alone and unable to make friends, but one day Hana, a classmate, approaches him, and they become friends. However, she soon reveals that she started talking to him because she belongs to a group that maintains "public morale” through sexual activities and, as part of her role, begins involving Shinji in sexual acts.

Hana and Shinji, the only boy in the academy, maintain "relief sessions” to control their sexual desires as part of keeping order. What began as a duty turned into mutual pleasure. However, when Hana missed class due to a cold, Chika, a girl passionate about sex, seized the opportunity to seduce Shinji, using her connection to Hana as an excuse. Unable to resist the provocation, Shinji gives in and unleashes his.