Namaiki na Ryouken no Shitsukekata

The drug dealer Shinjuku police station's detective Ao was tracking for half a year was caught by a man that appeared suddenly. The problem is that Ao inhaled some of the evidence by accident. A young man by the name of Noe helps Ao who has lost consciousness after the fact. He's reprimanded by his boss and receives sarcastic remarks from his co-workers. At that time Ao receives a photograph, a photograph that shows a dead Naji, who was Ao's S. It's hunt or be hunted, eat or be eaten, the heated race of the yakuza men.
(Source: Bakeneko Scanlations)