Total Recommendations: 2
If you liked
Darker than Black: Kuro no Keiyakusha
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...then you might like
M3: Sono Kuroki Hagane
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After a disaster which start in one area of the world, strange things appeared (in DTD it's contractor and it's admonition in M3) The both of them have a good dark ambiance and tend to make characters more interesting by their psychological behavior.
If you liked
Claymore
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...then you might like
Black Bullet
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In both of them, there are a threat for humanity that only girl/women half part human can eradicate. Girls are not considered like human and have visible characteristics (eye e.g.)