After the death of their mother, the Kasagi family became a single-parent household. The father worked himself to the bone for his daughter, and Ichika grew up watching her father, but Ichika began to have feelings for her father who was working hard for her. She tried to suppress these feelings by masturbating every day to console herself, but one day her father brought up the topic of remarriage, and Ichika, who is usually selfish, finally exploded with uncontrollable desires!!