The main protagonist, prior to the series was the son of a happy family who's father was a noodle shop owner. Coming back from school one day he learns his parents were killed in a automobile accident, he is then picked up by his grandfather, Isshin Arima who is the owner of the Arima Financial Combine, which is a very wealthy and powerful industry in Japan. Isshin then demands Teppei to become the successor to the Arima corporation and Teppei is enrolled in the most prestigious private school in japan.