Kongoh Bancho

Kongou Banchou (金剛番長) is a manga series written and illustrated by Nakaba Suzuki.

Plot
Akira Kongou is looking to take down the "23 district project" which involves "banchou" from 23 districts of Tokyo fighting for the right to control Japan. Without meaning to, he becomes a participant with the alias Kongou Banchou and must take down other banchou while searching for the leaders of the project.