Reiko Kasumi warmly supported her son and his friend Takahiro through the final stages of their college entrance exams, earning praise from those around her for her kindness. Takahiro, deeply drawn to Reiko, confessed his feelings and asked her out if he passed the exam. Touched and flattered, Reiko accepted. After both boys succeeded, Takahiro and Reiko began secretly dating behind everyone's back. Their bond grew increasingly intimate, eventually turning physical. Overwhelmed by the passion and pleasure of a younger man, Reiko gradually let go of her initial resolve, surrendering completely to these new, intense emotions.