Shinichi, the father of his student Koichi Okushima, suddenly came to the school. When Kana, the homeroom teacher, asked him why, he was told in unreasonable anger, "My son has become unable to study because you have seduced him! Your existence itself is harassment!" Since that day, Koichi has stopped coming to school, and Kana, worried, heads to his house, but... Shinichi presses her even harder, subjecting her to pleasure training in the name of "education." Her body is toyed with by the never-ending unreasonable "education" of her guardian...