 If you liked
Arifureta Shokugyou de Sekai Saikyou
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 ...then you might like
Boushoku no Berserk: Ore dake Level to Iu Gainen wo Toppa suru
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1) Both stories are set in a fantasy world
2) Both worlds have a game-like system
3) Both main character started as the weakest one and become the strongest in the world
4) Both main character have a special girl who want to protect
5) Both main character can steal abilities from his enemies.