異世界でチート能力を手にした俺は、現実世界をも無双する 6 ~レベルアップは人生を変えた~

[DeepL Translation - needs review] Volume 1 Introduction: A boy who has been severely bullied since childhood finds a door to another world. After leveling up in the other world, he creates a whirlwind in the real world through a door that allows him to travel between the two worlds... A life-reversal fantasy begins!

(Translator: DeepL)