 If you liked
World Teacher: Isekaishiki Kyouiku Agent
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 ...then you might like
Shindou Sephilia no Gekokujou Program
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1) Both main character died and were reincarnated in a new fantasy world.
2)Both main character shows a very proficient magic skill since a short age.
3) Both main character change the society's standarts with every action they do.
4) Both main character are the strongest in their worlds (as your typicial isekai character...)
5) Both main character get to master the magic system of their worlds.