Kamagasaki is an "invisible" slum of Osaka that attracts day laborers and prostitutes since WW2. When the local gang has its treasured cauldron stolen, a war to find it begins involving the thugs, a 12 years old kid, a prostitute and a pickpocket, including the giant cauldron used to feed the destitute: The symbol of Kamagasaki.

Punk rocker Okajima has never lost a fight. One day, his ex-girlfriend appears and asks him to save her current boyfriend from the yakuza.