 If you liked
World Teacher: Isekaishiki Kyouiku Agent
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 ...then you might like
Sekai Saikou no Ansatsusha, Isekai Kizoku ni Tensei suru
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1) Both main character were professional agents for an organization in their previous life.
2) Both main character died and were reincarnated in a fantasy world.
3) Both main character discover new ways to use magic.
4) Both main character got a really loyals fellows.
5) Both main character are stoic and calm.