Striking fear into the hearts of mortals, the Demon Lord Satan begins to conquer the land of Ente Isla with his vast demon armies. However, while embarking on this brutal quest to take over the continent, his efforts are foiled by the hero Emilia, forcing Satan to make his swift retreat through a dimensional portal only to land in the human world. Along with his loyal general Alsiel, the demon finds himself stranded in modern-day Tokyo and vows to return and complete his subjugation of Ente Isla—that is, if they can find a way back! Powerless in a world without magic, Satan assumes the guise of a human and begins working at MgRonald's to make ends meet. He soon realizes that his goal of conquering Ente Isla is just not enough as he grows determined to climb the corporate ladder and become the ruler of Earth, Whether it's part-time work or household chores this anime presents a hilarious view of the most mundane aspects of everyday life, all through the eyes of a hapless demon lord.
When the lord of demons and his horde waged war against the humans in their realm, a hero vanquished their army. Cornered, the Devil fled through an interdimensional portal to Earth. He vows to one day reign again, but until then... he needs a job!
Emilia the hero finally tracks down the ruler of demons on Earth. Meanwhile, Sadao receives a mysterious text from Chiho warning that more earthquakes are on the way.
Something supernatural seems to be going on with Chiho. Meanwhile, it's possible Maou seems to have a difficult time understanding certain concepts.
In the aftermath of the cave-in, Emi sees a side of Maou that doesn't jive with the demonic king. Meanwhile, everyone sees a side of the landlady that nobody could have expected.
Lucifer is wrecking the neighborhood in a big way and he's brought along some unexpected friends! Meanwhile, Emi, Maou, and Ashiya do the impossible and try to work together!
Back on Ente Isla, the other high priests find out about Olba's betrayal. Meanwhile, Lucifer's moved into the Devil's Castle.
Maou and company find that a young lady named Suzuno has moved in next door. She is quick to make friends but Emi wonders what her motives are.
Big problems arise when when a new fast-food restaurant opens up. Meanwhile Emi and Suzuno have many miscommunication problems.
Maou tries to handle the loss of business caused by the opening of a new restaurant. Meanwhile Emi and Suzuno need an impartial third party to resolve their dispute.
It's a busy day at the local amusement park, with crowded restaurants, animals on the loose, scary ghosts, and a much-needed swimwear intervention. Meanwhile, Suzuno feels the presence of a white-winged being watching her.
An encounter with a stranger has Suzuno reconsidering her position on the Devil. Meanwhile, Yusa begins stalking Sadao and Shiro around town and learns that they are living good, humble lives.
The archangel Sariel is willing to torture people to get what he wants. Soon, Satan and Sariel engage in an aerial battle that destroys half of the city.
Ashiya has something he needs to talk to his master about in private. Meanwhile, Emi also has a strange dream where Satan conquers Sasakuza.