Several years after losing her mother, the Amau family became a single-father, single-daughter household. The father worked himself to the bone for his daughter, and Ririka grew up watching his back. However, as she saw her father working so hard for her, she began to develop feelings beyond that of a parent and child. To suppress those feelings, she comforted herself every day with masturbation. But one day, her father suddenly brought up the topic of remarriage. That triggered Ririka, who usually never complained, and her long-hidden desires finally exploded!!