Kyoji Renjo is an elite businessman at an advertising agency, but his brother Koichi is a gangster who serves as the junior boss of the small Renjo-gumi gang. However, Koichi is tempted to assassinate the boss of the huge Kano-gumi gang, and is eventually eliminated... In the midst of this series of schemes, the father, the second-generation leader of the Renjo-gumi gang, who adheres to the code of honor, decides to take all the responsibility with his manly courage...!