Shinji Hanada, a member of the Yoshioka-gumi who idolises the yakuza, is ordered to act as a hitman to assassinate the boss of the rival Kawada-gumi. However, he fails miserably and is arrested, landing him in prison. Whilst there, in a shared cell block, he comes face to face with Kurokawa, a member of the Kawada-gumi with whom he has long sought to settle the score...