The main character, Kuuya, was adopted by the prestigious Hiiragiya when he was young. Having lived a weak life just spoiled by his sisters, he was entrusted to his distant relatives to retrain his sexual roots. And about 10 years later. Kuya grows up brilliantly and returns to Hiiragiya again. Even his younger brother started his life surrounded by adopted children, only one man, and six older sisters.