Passionate teacher Shiho witnesses bullying at school and intervenes to protect her student. However, contrary to her intentions, the delinquents' harassment only intensifies, subjecting the boy to daily abuse while Shiho helplessly watches, her body and mind growing weary from the strain of trying to save him. Gradually, she realizes her feelings for her student have deepened beyond those of a mere teacher. One day, after rescuing him from the bullies, Shiho rushes into a restroom where, once alone, she gives in to her emotions and begins masturbating. Unbeknownst to her, her act may have been watched by someone.