 If you liked
Death Note
|
 ...then you might like
Claymore
|
They both contain large amounts of blood and killing.
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Recommended by Ihateanimealot
Both Claymore and Death Note have very dark themes and a non-conventional plot (that you really have to pay attention to to understand). Although the lead characters have different ideas (Light has a twisted view of justice while Clare is more sensible about it), they do have things in common: for one they're both serious, and (I think the most significant similarity of both leads) they both have an intense desire for power to achieve what they want.
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Recommended by SlaughterDagger
Plus, both are animated by Madhouse and have opening themes performed by Nightmare. And Guilty Sky kind of sounds like Eraser Rain.
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Recommended by Doctor_Cragmire