 If you liked
World Teacher: Isekaishiki Kyouiku Agent
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 ...then you might like
Kage no Jitsuryokusha ni Naritakute!
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1) Both main characther died and reincarnated in a fantasy world.
2) Both main characther have talent for magic since they are child.
3) Both main character hide their true power.
4) Both main character get a cast of girl that follow them blindly.
5) Both main characther "work in the shadow".