 If you liked
Mx0
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 ...then you might like
Shijou Saikyou no Deshi Kenichi
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After the protagonist gets influenced by a girl, he gets sucked into a completely different world where he needs to use more brain than brawl (or magic).
In Kenichi, since the protagonist is a total beginner in martial arts but still gets teaching from the best fighters of the world, gives him similar a position to his opponents as Kuzumi gets from the gold card in Mx0