Koichi was disturbed by the screams of his mother, Yuri, leaking from his parents' bedroom. He was aware that his parents were making plans to have children. From his son's point of view, it may be a blessing. However, when he learned that Yuri had a lewd side that he had never touched, an uncontrollable emotion welled up inside Koichi. jealousy of his father. And the monopoly desire to want to own all of the lilies. When that emotion reaches its limit, Kouichi's distorted affection for Yuri crosses the forbidden line.
