 If you liked
Class ga Isekai Shoukan sareta Naka Ore dake Nokotta n desu ga
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 ...then you might like
Solo Leveling
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Both stories are about two High School student that get a game-like feature power which let them progress very fast in comparison with other characters of their worlds, making them really overpowered. Also both main character have a calm attitude when they are facing strong enemies.