Do you want fries with your hellfire? Being soundly thrashed by the hero Emilia, the Devil King and his general beat a hasty retreat to a parallel universe...only to land smack 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?!

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!

Do you want fries with your hellfire? A portal opens in the courtyard of the Devil's Castle (a tiny walk-up). From it emerges a little girl who calls the Devil King "papa" and the Hero "mama." Ashiya and Chiho are shocked to discover that Maou and Emi had that kind of relationship, but nobody's more surprised than the two new "parents." Will Maou the breadwinner be able to make the grade when it comes to child rearing? And will this spell the end of the starry-eyed Emi's romantic ambitions?

Do you want fries with your hellfire? With their modifications to turn Devil’s Castle into a rocket ship finally complete, Maou and the rest of the Ente Islans prepare to mount an assault on heaven. Before that happens, though, there’s something the Devil King needs to take care of—fessing up to Chiho’s dad about just what the heck he’s roped her into! What revelations await Maou and company high above the sky? Can they really take down a god? And at the end of it all, what will become of the lives they’ve worked so hard to scrape together in Japan?

Do you want fries with your hellfire? To fight Ignora, Maou's group must restore Devil's Castle to its former glory. However, because of his schedule at MgRonald, Maou needs to save time on his commute by staying in Japan. While he's stuck there, Suzuno, Laila, Albert, and Rumack travel to the Northern Continent to retrieve the Spear of Adramelechinus. Maou, unable to help them-and living the bachelor life, alone in his apartment for the first time-receives chocolate from a work trainee, but how will the other women in Maou's life react to that news?! The Devil King faces off against his next enemy: Valentine's Day!

Do you want fries with your hellfire? Sadao Maou, the Devil King, has finally been promoted to store manager! And who should move in next door to his fortress (actually a tiny studio apartment in a dingy walk-up) but a lovely kimono-wearing lass. But the former devil-crushing hero Emi Yusa is none too pleased with this turn of events, to say nothing of high schooler Chiho Sasaki, who's still nursing a terrible crush on the Devil King. Meanwhile a Sentucky Fried Chicken has opened up right across the street from Maou's beloved MgRonald! It's the first real test of his managerial prowess, and he's facing a pay cut unless he can top Sentucky's sales! Between the two new neighbors, the Devil King's troubles are anything but part-time!

With his beloved MgRonald closed for renovations, the Devil King's out of work! Worse, the apartment he shares at Villa Rosa Sasazuka has gotten damaged thanks to his fight with Gabriel, which means the household has to temporarily vacate the premises. Having lost both his title and his vast land holdings, the Devil King takes a part-time job at his landlady's niece's beach house--and of course Chiho and Emi insist on coming along. It's summertime at the beach, but the Devil's still got work to do...!