The story is about how and why a guy goes from a worker at a dead-end job to becoming a boxer.
Boys on the Run is a completed manga by Hanazawa Kengo, first published in 2005. It blends action, romance, comedy and sports. You can read all 116 available chapters of Boys on the Run online for free on MangaPulse; the newest is Chapter 116, added 2018-02-02. The series is finished, so you can read it from start to end in one go.