 If you liked
Trinity Seven
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 ...then you might like
Kage no Jitsuryokusha ni Naritakute!
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Both series have a academy style premise where the main character uses his harem to fight against bad guys. They are both dark action fantasy themed and feature varying degrees of gore and atmosphere. I personally think Eminence in Shadow has a more gritty and unforgiving atmosphere with its deeper levels of violence and ruthless appeal.