Maki Tomoda is a mother with an only son about to advance to school in spring. She has raised her son with deep affection, though tending to be overprotective. One day, she receives news that her son committed a sexual assault on a female student at school, leaving her shocked. The scandal threatens her son's guaranteed recommendation for advancement, dealing her a devastating blow. The teachers approach her, pleading "for the sake of your child's future," and present her with a settlement condition: submit to the male teachers for one day. Willing to do anything for her beloved son, Maki complies. Yet, as the ordeal unfolds, she gradually becomes aware of her own masochistic nature, awakening to her deepest, most primal desires.