Kana, a married teacher at the same school as her husband, Kenichi, faces a dilemma. While her class consists of top-notch students, Kenichi struggles with the class troublemaker, Yano. Concerned for her husband, Kana's worries come true when she witnesses Yano and another student, Ichii, in a heated argument after school. Kenichi hastily accuses Yano of bullying and imposes a punishment. However, Kana discovers that Ichii is the real culprit. The next day, Kana is summoned by the furious Yano, who demands that she atone for her husband's actions with her own body...