Buchigire Ganbo

From MangaHelpers:

Kanzaki has come a long way from the beginning of "Gokuaku Ganbo," and he is now an established "fixer" (conflict resolver) for the underworld of Hiroshima. In this new story, another main character is introduced: the ministry bureaucrat Ninomiya. He wants to progress in his career, but he has a bit of a complex about having attended a 2nd tier university. Ninomiya and Kanzaki are as different as oil and water, but when they meet, they will end up resolving many new conflicts that span both their worlds! [tethysdust]