Shigofumi's first 2 episodes, it's quite morally ambiguous.I say just the first couple episodes because it's the first arc that has what you're looking for after that there's other stories that are unrelated but the first arc is pretty much self contained.
There's a great line in one episode,one of the characer says:
Quote:
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Be careful, this criminal is very pure hearted. You have nothing to fear from criminals who have something to gain from blood or money.The most fearsome ones are the pure hearted criminals.
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