Carefree high school student Nanamura Hikaru has little memory of his late father, a popular playboy actor. His father's suave attorney, Shimogura, contacts him with the promise of a sizable inheritance. The catch? Hikaru has to meet his eight half-brothers - the fruit of his father's philandering ways. Meanwhile, he finds himself attracting the interest of handsome older student (senpai) Ashinuma.