 If you liked
World Teacher: Isekaishiki Kyouiku Agent
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 ...then you might like
Tensei shichatta yo (Iya, Gomen)
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1) Both main character are reincarned in another world
2) Both main character are genius in the magic since his childhood
3) Both story are set in a fantasy world
4) Both main character come from a noble family
5) Both main character preserve the memories of his previous life
6) Both main character are very overpowered