Kintaro is a reformed delinquent, the former leader of a biker gang who has gone straight. Working at a construction company, his unorthodox tactics cause trouble with his colleagues. He is transferred to a tiny countryside branch, where he butts heads with his lazy superior until the two men discover a plot by the competition to put the construction company out of bussiness. With the help of his old biker friends, Kintaro prepares to confront the masterminds behind the scheme.