サラリーマンが異世界に行ったら四天王になった話

In an alternate fantasy world, the Demon King reigns with a formidable army led by his Four Heavenly Kings. One happens to be Uchimura Denosuke, a normal salaryman unexpectedly plucked from his mundane life by the Demon King himself. But even in this new realm, Uchimura is bestowed no particular powers. Can h...