Rina comes home one day to find that her mother, who had left the family when Rina was a little girl, has returned an invalid, and her father wants her to take care of her from now on, upsetting Rina, as her mother treats her harshly. She tries to use Hell Girl to get rid of her mother, but discovers that her father has already contacted Ai. Her father reveals the truth: her mother is not really her real mother. After discovering she was infertile, his wife suggested he have a child with another woman. However, she was only testing him: when he really did do that, his wife, unable to accept it, attempts suicide. Rina's father sends her to Hell after she says she cannot forgive him or accept Rina, although Rina does not blame her mother now.