The third son, Hikari, who suddenly became NH, came back, although he was supposed to live alone with his eldest son and second son while his parents were away due to his grandfather's illness. The two brothers who are upset can't suppress their excitement at Hikari, who looks too beautiful, and ask for their bodies. In addition, Hikari is also lusting for the relationship with her two older brothers and says, "I want to try it with three people...!"
