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～

Yūya Tenjō is a middle schooler targeted by bullies and written off by his family, until he inherits his late grandfather's house and discovers a door inside that opens onto another world called Argena. Killing the monsters on the other side levels him up in the literal video-game sense — and the gains carry back to the real world, remaking his body and giving him abilities that flip his social standing at the elite Osei Academy overnight.