Kangokou High School's student, Matsushita Tadashi, is constantly targeted by bullies from the school who regularly beat him up after hours. His friend, Saitou Takaki, also endures harassment from these bullies. Fed up with being victimized, the two consider joining the Karate Club, which has a reputation of training some of the toughest teenage thugs in Osaka's youth gangs while masquerading itself as a legitimate sports club. However, upon joining the club, they realize that they face even more bullying from the current members.
