Koharu got good grades at school and was doted on by his parents. A tutor came there. Koharu acts like a good kid in front of his parents, but Koharu makes fun of him every day because of his low academic background. And finally, the tutor's revenge begins... Koharu's physical freedom is taken away by the rays of light. Although she resists, she is raped in front of her parents, and her deep psychology is revealed through further harassment.
