はたらく魔王さま! Hataraku Maō-sama

はたらく魔王さま! Hataraku Maō-sama, lit. Working Demon King! or Demon Lord at Work!) is a Japanese light novel series written by Satoshi Wagahara, with illustrations by Oniku (written as 029). ASCII Media Works has published eight volumes since February 2011. The story is about a demon king named Satan seeking to conquer the world of Ente Isla but, when confronted by the Hero Emilia Justina, is forced to retreat through a portal that transports him to modern day Tokyo, Japan. To survive and find a way to return to Ente Isla, Satan gains part-time employment at a fast food restaurant. There have been two manga adaptations published by ASCII Media Works in Dengeki Daioh and Dengeki Maoh. A 13-episode anime adaptation produced by White Fox and directed by Naoto Hosoda aired between April and June 2013.

Plot

The Demon Lord and one of his generals, Alciel, escape Ente Isla through a portal to modern Tokyo, Japan after being confronted by the Hero Emilia Justina and her companions. However, due to the lack of magic in the modern contemporary world, both the Demon Lord and Alciel change into forms representing what they would look like if they were human. In order to survive, the Demon Lord takes a part-time job in a fast food restaurant named MgRonald while Alciel serves as his houseman. One day, the Demon Lord, who now goes by Sadao Maō, meets a girl who is actually the Hero Emilia, who now goes by Emi Yusa. The story then unfolds and explores the personalities of each of the characters and their moral values. More characters show up from Ente Isla and they too face the new world dilemmas, often comically.

Credit :

http://en.wikipedia.org/wiki/The_Devil_Is_a_Part-Timer!

http://www.emptyblue.it/post/2013/05/21/Hataraku-Maou-sama-A-new-enemy-is-here-Be-careful-Emilia.aspx