金剛番長, lit. Diamond Delinquent is a shōnen manga by Suzuki Nakaba. The manga was serialized in Shōnen Sunday from 2007 to 2010, it has been collected in 12 tankoubons.
Kongou Akira 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
