According to the digital version Kadokawa Dengeki Bunko magazine , volume 21 of the Hataraku Maou-Sama will be the last.
Below, a synopsis of the work and an image of volume 20, released on December 7th
Synopsis: The Demon King Satan was just one step away from conquering the magical world of Ente Isla, but he was defeated by the heroine Emilia Justina and forced to travel to another world: modern-day Earth. Due to the lack of magic in this world, Satan and his faithful squire Alsiel assume human form. Now, under the name Sadao Maou, the Demon King must freelance at a fast food chain to survive and pay his expenses. From then on, Sadao and Alsiel (now under the name Shiro Ashiya) begin living as humans while planning to return to Ente Isla and thus dominate it and Earth. What he didn't count on was that Emilia would also come to Earth, aiming to kill him. (via: Wikipedia )
Hataraku Maou-Sama also received an anime in 2013 , with a total of 13 episodes.
Even though years have passed since the anime aired, fans around the world are rooting for a second season.
Source: ANN
