 If you liked
World Teacher: Isekaishiki Kyouiku Agent
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 ...then you might like
Goblin Slayer
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1) Both stories are set in a fantasy world
2) Both main character are very intelligent
3) Both main character are cold and calculator
4) Both main character build a harem without any intention
5) Both main character use mainly weapons instead magic
6) Both stories have several gore and sexual scene