The manga centers on Jouichirou Shishido, a 19-year-old man whose frank honesty has cost him 26 part-time jobs. One night, he runs into a group of muscular bodyguards who protect the streets at night, members of a private security firm known as “Tokyo Fist,” which ends up changing his life.

17-year-old Iguchi Tatsuya has just been released from juvenile detention and is on probation. He's been relocated to a new area, away from the bad influence of his old friends, and is under the care of his aunt. He is determined not to be sent back to lockup, and he works hard in his aunt's restaurant. However, he still has the same personality, the same tendency to violence, and still falls in with the same sort of people. It's going to be difficult for him to stay out of trouble