The Four Heavenly Kings of the Demon King's army reign over a certain alternate world, and the one chosen as the fourth of them... is none other than an ordinary salaryman, Uchimura Dennosuke! After being headhunted by the Demon King's army, Uchimura is welcomed into a director-level position... but business in the Demon King's army is one life-or-death mission after another! Since Uchimura has no particular powers, he must tackle every challenge he faces in this new world using the experience and knowledge of a salaryman!