After her parents divorce, Kotori lives alone with her father, Naoto. Over time, she develops intense feelings for him, wanting to take her mothers place. Naoto tries to control his own desires but resorts to papa-katsu (paid dating) for sexual relief. Rina, Kotoris shy and submissive friend, is barely noticeable but maintains a friendly relationship with her. One day, Rina confronts Naoto, appearing semi-nude, showing him her breasts and a