 If you liked
Kuroshitsuji
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 ...then you might like
Ao no Exorcist
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Maybe people wont find this similar, but i think they have their similarities. Both are shonen, and im so used to them that i liked them both.
They have this demon thing in their main characteres, that make them have to hide their really personallity from others outside the world. I really like the relationships Sebastian-Ciel and Rin-Yukio-Shirou, thats another similaritie. And these animes have strong and lovely secondary characters like Mephisto o Shura in Ao no Exorcist and Grell and Undertaker in Kuroshitsuji.