The wealthy old man Satou made his fortune in a single generation since starting his business and is now trying to step down from his chairman position. He feels he doesn't have much time left in life and is burdened by his estate. Mio and Sei, hearing this through the grapevine, visit him after nearly a decade since they were children. Although they were close as kids, they now fight and exchange insults over the inheritance. Both try every trick in the book to win Satou's favor.
