 If you liked
Ragna Crimson
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 ...then you might like
Hametsu no Oukoku
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Both of this anime are about a man looking for a revenge in whole race because how they treated their love(well, I can even say because they killed them). Both of mc are humans in a world surronded by other creatures and decided to kill every member of those race. But both anime go in a bit different way since male mcs have different personality.