He has worked at Teiai Group for many years and is the favored ace of Kurosaki Yoshihiro. He created the pachinko machine called the Bog. It was made in a way that it impossible for anyone to get the max payout unless he desires it to. He is Kaiji's opponent. He is shown to be very confident person. He is shown to have a superiority complex about his own abilities, and looks down on other people like Kaiji or his former classmates. However when unexpected events happens, he loses confidence.