Masakazu lived in a father-son family since he was young. This summer, my father, Noboru, remarried Honoka, a subordinate of the company. As expected of father and son, the young and beautiful Honoka is Masakazu's favorite, and Masakazu gets lustful every day. One day, Masakazu, Noboru, and Honoka take a short trip to a local hot springs inn to celebrate their remarriage. However, Noboru left the inn because something unexpected happened. That's how the immoral sex party began...
