In this spin-off of the popular novel series, the Devil King Maou and Emilia, the Hero, are reincarnated after their terrible battle as high school students in modern-day Japan! Add in the innocent Chiho, a fellow student with a crush on the former lord of darkness, and you've got a high school comedy devilish in its scale!
After being soundly thrashed by the hero Emilia, the Devil King and his general beat a hasty retreat to a parallel universe... only to land plop in the middle of bustling, modern-day Tokyo! Lacking the magic necessary to return home, the two are forced to assume human identities and live average human lives until they can find a better solution. And to make ends meet, Satan finds gainful employment at a nearby fast food joint! With his devilish mind set on working his way up the management food chain, what will become of his thirst for conquest?