Tokyo Yamimushi: 2nd Scenario - Pandora

The story of the sequel manga revolves around Kō Nonomiya, a respectable, upstanding salaryman. One night, his subordinate Naoki Takahashi brings him to a cafe where Nonomiya becomes the victim of an outrageous ripoff. Nonomiya then meets Asamura, a debt collector who lives in Tokyo's darker recesses, and the salaryman comes face-to-face with the hidden, crime-ridden underworld of the metropolis.

(Source: AnimeNewsNetwork)