Hina lived peacefully with her non-blood-related father and brother. However, after being raped by her brother due to a misunderstanding, she confides in her teacher, who is struggling with his own personal issues. The teacher, a pervert who is separated from his wife, finds himself comforted and sexually aroused by Hina, leading to intercourse. Hina harbors a strong desire to become her father's wife and actively pursues him with serious seduction. In this way, their enjoyable incestuous relationship continues.