 If you liked
Blood+
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 ...then you might like
Ao no Exorcist
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They both heavily involve supernatural elements (Exorcist = demons; Blood+ = vampires) and a main character who is darkly connected to those very forces that he/she fights. Both series are quite fast-paced and exciting, and the first episode or two of either should suffice to draw you in.
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Recommended by inspecteurjavert