Maou charges through a life-and-death battle to bring Emilia and Alciel back to Japan. Meanwhile, the objective of Gabriel and the Angels, as well as their hitherto unknown past forms, is finally revealed!

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? 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?!

Scattered and alone, the members of the Armed Detective Agency disappear one by one as Kamui, the leader of the Decay of the Angel, seeks to eliminate them once and for all! But Atsushi and the others aren’t out of the fight just yet. As they piece together allies and information in preparation for a counterattack, the return of a familiar face brings hope that they may be able to turn their desperate situation around! However long the night, the dawn will break—the agency’s revival is at hand!

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? 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!

BACK TO WORK After their life-and-death battles on Ente Isla, Maou and company finally return to Japan to resume their daily lives. But as they settle back into the mundane humdrum of peace, there are still mysteries left to be revealed. For instance—just how did the powerless demon boy known as Satan rise to become the Devil King in the first place?