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|The Demon King Fulfills His Duty||N/A|
|Episode 13 -The Demon King and the Hero Do Some Honest Hard Work|
|Season One, Episode Thirteen|
|Rōmaji||Maō to Yūsha, Mattō ni Shigoto ni Hagemu|
|Air Date||June 27, 2013|
|Written by||Satoshi Wagahara|
|Directed by||Naoto Hosoda|
|Episode 12 - The Demon King Fulfills His Duty|| |
Chiho has a strange dream where Satan leaves Earth and returns to Ente Isla, leaving her behind much to her agony. While recalling the dream to Sadao the next day he confirms that he doesn't have enough magic to return since he used it all repairing the city from his and Sariel's battle the previous day. At the same time, they discover Sariel in MgRonald's freezer since Sadao's magical bamboo had redirected his portal. Sariel immediately falls head over heels for Mayumi much to her disgust. Meanwhile, Emi also has a strange dream where Satan conquers Sasakuza. As she goes to visit Sadao and co. Shirō asks Sadao for some time off which makes her suspicious, causing her to enlist Emeralda to see what they might be up too. Later, Emi notices numerous boxes being delivered to Sadao's apartment and grows even more suspicious. At work, Sadao suddenly asks Mayumi for a shift change which causes Chiho to fear that he might return to Ente Isla, but Sadao apologetically keeps their motives hidden from her. Chiho and Emi decide to follow Satan the next day to find out what they have been up to and discover that he along with Shirō had taken extra jobs to pay for Hanzo's GPS trackers which had saved them from Sariel. As Emi questions Sadao on the boxes, they return to the Villa Rosa to discover that Hanzo had been caught in a purchasing scam whereby he was tricked into buying useless items. Sadao and Emi head over to the retailer to claim a refund, and discover that Shirō had been working there, along with a threatening manager who refuses a refund due to a contract Hanzo had signed. Emi is able to solve the situation via a Cooling-off period. Eventually Shirō and Sadao celebrate their success by going out to a restaurant, while everyone goes back to living normally in the human world.
In the epilogue, Sadao is forced to walk home through the rain after work. While waiting at the crosswalk, Emi approaches and gives him a new umbrella as a replacement for the one he had lent her. Sadao thanks her and she welcomes him with a smile.