Unsō-ya no ossan ga naze ka fukugyō de zettai muteki kenshi o tsutomeru koto ni ~ sae nai jinsei o okutteta ore ga maō tōbatsu no kirifuda ni?~

Jack is a boring middle-aged deliveryman leading an ordinary and uneventful life, until one day, he’s suddenly called to the royal capital. Having no idea what he’s done or what’s in store for him, Jack heads to the capital, but waiting for him there was…?!