Katagawari.

Two outsiders get caught up in the underground world of the Japanese yakuza after one of them runs up an insurmountable gambling debt. The other has to help shoulder the debt in order to clear his name. After joining the Japanese yakuza they get a taste of the exciting and ever rewarding life of the Japanese yakuza. Drugs, alcohol, women and power starts to consume one of them to the point of ending their friendship. Something has to be done to restore order.