 If you liked
Darker than Black: Kuro no Keiyakusha
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 ...then you might like
Kabukichou Sherlock
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They both have very jazzy soundtracks, similarly dark urban vibes, and an eccentric cast of characters. One is about a group of hired hands, often used as bodyguards or assassins, the other is about a group of detectives that take various jobs. In this way, the shows are both essentially about their characters taking odd-jobs, separated into smaller arcs that culminate into an over-arching story. Sherlock is much more comical and goofy, but they both feel like they could have come from the same creator. The character designs could easily be moved around between the two and wouldn't feel out of place.