 If you liked
Speed Grapher
|
 ...then you might like
Innocent Venus
|
Speed Grapher is a pretty dark anime, there's a lot of hate and misuses of power. Innocent Venus isn't quite as dark but still has it's fair share of issues.
They both have the typical young mystical girl, bad organization after them, and a few lovable characters along the way.
Both stories are pretty interesting and if you like one give the other a chance.