According to the digital version Kadokawa Dengeki Bunko magazine , volume 21 of 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 Ente Isla, however, he ended up being defeated by the heroine Emilia Justina and forced to go to another world: the Earth of modern times. Due to the lack of magic in this world, Satan and his faithful squire Alsiel assume human forms. Now, under the name Sadao Maou, the Demon King needs to become a freelancer at a fast food chain to survive and pay his expenses. From there, Sadao and Alsiel (now under the name Shiro Ashiya) begin to live as humans while planning to return to Ente Isla, and thus dominate it and Earth. What he didn't expect was that Emilia would also come to Earth, with the aim of killing 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 of the work around the world are rooting for a second season.
Source: ANN
