 If you liked
Darker than Black: Kuro no Keiyakusha
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 ...then you might like
Sword Art Online
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Both of these anime include great/cool fighting scenes, and the characters play out the "dark" bad guys (less in SAO). Darker than Black has magic, but SAO doesn't. And the artwork is different, but great, in both. If you've seen one and liked it, you'll probably like the other!