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～ raw 第01-07巻 [Isekai de Chito Sukiru o te ni Shita ore wa Genjitsu Sekai omo Muso Suru Reberu Appu wa Jinsei o Kaeta vol 01-07]

From Yen Press:Yuuya has always been a loser, and after the death of his grandpa (the only person he had in his corner), he’s sure there’s no point even trying anymore. But when Yuuya moves into his late gramps’s home, he inherits a two-way door to another world. Access to this new realm might be just the cheat Yuuya needs to succeed in his everyday life.