Shin'ichirou, a hardworking student at the Shimuro Aikido Doujou, harbors a deep admiration for his talented childhood friend and senior, Aoi. When Aoi asks him to help her overcome her fear of men through "endurance training," the boundaries between them blur, leading to a passionate confession and an intimate encounter that transforms their relationship.
Narumi, the swimming club president, is plagued by an uncontrollable obsession with racing swimsuits that threatens his reputation and standing at school. To curb his lust and prevent him from being expelled, Kuroe of the public morals committee takes a drastic approach by wearing a swimsuit herself to satisfy his desires. This unexpected "duty" leads to an intimate encounter as Kuroe attempts to help Narumi find a release for his passion.