The show is about Makio Sakaki, also known as "Tornado", a 27-year-old yakuza gangster, who wants to succeed his father as the head of the gang. However, Makio is not very bright, so his father decides to send him back to high school and makes a deal with him: if he can graduate he can become the new leader of the gang. If Makio doesn't graduate, the position of boss will be given to his younger brother, Mikio.