Naikaku Kenryoku Hanzai Kyousei Torishimarikan Zaizen Joutarou

Based on Ken Kitashiba & Yasuhiro Watanabe's political intrigue detective manga.

The close relationship between political and business circles doesn't die; politicians and government officers line their pockets taking advantage of their positions.
Zaizen Jotaro is an investigator who is allowed to use extralegal methods to crack down these power abusing criminals.

(Source: AniDB)