While fulfilling her duties as a grade-level supervisor, Maki Hojo becomes entangled in an affair with a fellow teacher. Struggling to maintain her image as a principled and upright educator, she finds it increasingly difficult to suppress her hidden desires. One day, unsanitary conditions begin to plague the school, drawing attention to the janitor, Shiraishi, who is accused of neglecting his cleaning responsibilities. As the investigation unfolds, it becomes clear that Shiraishi has an extremely poor work ethic—habitually late or absent, careless in his duties, and even drinking on school premises—appearing at first glance to be utterly irresponsible. Maki confronts him harshly, expressing her anger at his unprofessional behavior, but her reprimand only fuels his resentment. From there, the situation spirals into something far more complicated...