Kaoru Hanabishi appears to be an average university student, but in actually, he's the eldest son of Yūji Hanabishi, the head of the Hanabishi Zaibatsu, and was set to take over the zaibatsu after his father retired. His mother, Kumi Honjō, and his father never married, making life difficult for both him and his mother. Kaoru's father died when he was five years old. Since then, Yūji's grandfather, Gen'ichiro Hanabishi, took Kaoru under his wing and began educating him for the eventual succession. Yet Kaoru never felt at home in the Hanabishi family and left to live alone in self-imposed exile after his mother died. Day by day he felt alone, thinking that he was living life with no reason pushing him on.