 If you liked
Kuroshitsuji II
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 ...then you might like
Jibaku Shounen Hanako-kun
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Black Butler #2 specifically.
No spoilers.
In BB2, there is another character who acts as a polar opposite, yet still apart of the same coin. There are ounces of dark twisted scenarios between the MC and the other character.
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Both anime's are shounens, and the MC's are roughly ~12-13.
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Dark, psychological, and traumatic, for both characters, and yourselves! (Not scary, just...SAD, SO VERY SAD, yet totally AWESOME at the same time!)