ナニワ金融道 －Naniwa Kin’yūdō－ Bunkobon

The protagonist is Tatsuyuki Haibara, a young salaryman, Tokyo-born but living in Osaka. He loses his job at the start of the series and seeks work in the financial sector, but is repeatedly unsuccessful despite his intelligence and aptitude. (Haibara had been pressurised into keeping his previous employer afloat with large personal loans, behavior highlighted in his credit rating and regarded as suspicious even though he repaid them.) Exhausting his options, he applies for a position at a small, shady loans company with links to the yakuza. Haibara is hired, but soon realises that his colleagues are little better than loan sharks, quick to intimidate clients who default.