 If you liked
Darker than Black: Kuro no Keiyakusha
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 ...then you might like
Mushi-Uta
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Yet another show where you've got certain people suddenly developing powers, factions of them grouping together, factions of humans trying to control or eliminate them, and various protagonists on the different sides. Similar at least in terms of the super-powers and the not-quite-making-sense-ness of it.