 If you liked
Darker than Black: Kuro no Keiyakusha
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 ...then you might like
Persona 4 the Animation
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Make a contract with me and become a... paranormal investigator... of sorts?
P4 and DtB have a similar aesthetic going on. Very dark, muted colours for serious scenes, vivid colours for more relaxed endeavours. When the action gets going, it's flashy. Very, very flashy and over the top. Moral dilemmas. Sexy collarbones. It's all here.