When I Was Reincarnated into the World of an Ultra-Difficult Game, I Ended Up As the Sole Subordinate of the Ridiculously Strong yet Incompetent Demon Lord, Tasked with Creating a Dungeon

Native title: 超難関ゲーム世界に転生したら、ポンコツ最強魔王様のたったひとりの部下としてダンジョンをつくることになった