 If you liked
Dendrobates
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 ...then you might like
Brutal: Satsujin Keisatsukan no Kokuhaku
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These two manga are about criminal acts against the weak, and the culprits try to get away with their crimes. These crimes are violent to say the least.
The main characters (anonymously) perform vengeance against those implicit criminals and murderers, and not by softly taking them into custody.
*Both MCs have a secret double life.
*Both are very bloody.