 If you liked
Speed Grapher
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 ...then you might like
Zettai Karen Children: The Unlimited - Hyoubu Kyousuke
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In both series, there is a superpower theme related to individuals with supernatural abilities.
The setting of both series also have a similar feeling in a city where there is crime, hungry power individuals, and organizations with dark ambitions.
The main female characters from the series also has their own powers which they use to help with various tasks.
Both series contains action, drama, and a mysterious like background as well.