The Devil is a Part-Timer! When Satan is run out of his infernal kingdom, he finds himself virtually powerless in modern-day Tokyo. Stuck in a feeble mortal body and desperate for cash, there's only one way for the dark lord to survive: by getting a job manning the deep fryer at "MgRonald"!

As Satan flips burgers and tries to regain his evil magic, he's pestered by a righteous hero who tracked him to Earth, a video-game-loving fallen angel looking for a way back into heaven, and the most unholy of enemies: a rival fast food franchise. Will he figure out a way to reclaim his homeland and throne? And if not, will this demonic burger king at least sell enough featured menu items to be promoted to shift supervisor? The devil can't survive on minimum wage!