A mother was so saddened by the death of her beloved dog that she named her newborn son after her beloved dog. Koro Kinoshita, who is worried about his girlfriend's name, is a troublesome student at Tamaishi Academy Junior High School. However, due to the death of Koro's father, Hideyoshi Kinoshita, a big name in Japanese politics and business, Koro inherits the most powerful position in Japan. Koro uses the power and money he inherited from his father to turn Tamaishi Academy into a harem, but then the boss of Ankoku Academy and the son of a Japanese underworld don, Ankoku Menkichi, declares war...!