 If you liked
Akumetsu
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 ...then you might like
Hammer Session!
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Both these series may not seem all that similar to you, but i assure you it's somewhat is.
Both of the protagonist uses harsh methods for justice or show what is right and wrong. In hammer session it's to teach the students what's right and what's wrong and to not do it again, while in Akumestsu it's to show what will happen to those who follow in the footstep of "EVIL".
Both great manga's if you're into complicated things. However Akumestsu is darker and has alot of gore and killing.