While he was caring for his grandfather and had no parents, he was supposed to live alone with his eldest son and second son, but Hikari, the third son who suddenly became NH, came back. The two older brothers, who are upset, cannot suppress their excitement because of the too beautiful appearance of Hikari, and each seeks their body. In addition, Hikari was lustful for the relationship with her two older brothers and said, "I want to do it with three people ...!".