 If you liked
World Teacher: Isekaishiki Kyouiku Agent
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 ...then you might like
Kuro no Souzou Shoukanshi: Tenseisha no Hangyaku
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1)Both main character died and were reincarnated in another world
2) Both stories are set in a fantasy world
3) Both main character are very stoic
4) Both main character are stronger than anyone in that world
5) Both main character maintain relationship with important people