While the parents were away taking care of their grandfather, the eldest and second sons were supposed to live alone. However, the third son, Hikari, who had suddenly become an NH, returned home. The two brothers, taken aback, couldn't contain their excitement towards Hikari's overly beautiful appearance and each sought his body. Moreover, Hikari also became aroused by his relationship with the two brothers and blurted out, "Let's do it together...!"
