The Kasagi family became a single-parent household after the mother passed away. The father worked himself to the bone for his daughter, and Ichika grew up watching her father's back, but at some point, Ichika began to have feelings for her father that were more than just father-daughter. She had been masturbating every day to suppress those feelings and comfort herself, but one day when her father brought up the topic of remarriage, that became the trigger for Ichika's suppressed desires to finally explode!!