Author: Suzuki Nakaba
Serialized in Japan in: Shogakukan's Shōnen Sunday
Scanlaters: Chuudoku Banchou http://chuudokubanchou.wordpress.com/
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.
I read all the chapters scanlated so far up on Onemanga, they're awesome. The main character is possibly the toughest guy I've ever seen, heh, he's real old-school in terms of personality. There's a good mix of action and comedy (mostly action), and the story has progressed at a good pace so far.
So start reading NAO!!!
P.S. I basically copied RAGNORAK's template for the thread, so thanks for making this easier to do ^_^