Hirona, the stepdaughter of his new marriage, moves into the house, and the father begins to enjoy a peaceful and happy daily life. However, this tranquility doesn't last long. Hirona gradually reveals her true nature, seducing her father whenever her mother isn't looking. With her smooth, translucent skin, she draws him in, captivating his heart. As a man experiencing fatherhood for the first time, he completely succumbs to her, losing all self-control. This story begins at the moment one step is taken forward, depicting the conflict between familial bonds and desire.