The student, Kouichi Oshima's father, Shunichi, suddenly barged into the school. When the homeroom teacher, Kana, inquired about the reason, he accused her of distracting her son from his studies, saying, "Your presence itself is harassment!" Since that day, Kouichi has stopped attending school, and the worried Kana went to his house. However, Shunichi became even more aggressive towards her, subjecting her to what he called "education" - a form of pleasure-based training. Her body, tormented by this endless and unreasonable parental "education"...