ボロ雑貨屋の俺、異世界転売で一発逆転

He inherits a failing grocery store. Desperate to save his sick girlfriend, he discovers a door to another world. He trades food for treasure in the apocalypse, then strikes a “food for magic pills” deal in the fairy realm. Soon he’s running a secret interdimensional business. And his rise is just beginning.（From Qingdao Jingqidian Culture Media Co. Ltd.）