I Got a Cheat Skill in Another World and Became Unrivaled in The Real World, Too

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 ～レベルアップは人生を変えた～

Constant bullying has worn Tenjou Yuuya down to nothing when he finds a door that leads to a world of dungeons, monsters, and equipment strong enough to change his life on both sides of it. Before any of that he had stepped in to protect a girl named Kaori Houjou from thugs and taken a beating for it; the gear he starts bringing home means he no longer has to lose those fights. Beyond the door he pulls a princess, Lexia von Arcelia, out of a monster attack, and her problems follow him back. This light novel is the source material for the anime adaptation.