Sadao Maou  

Milord, Satan, 真奥 貞夫 / サタン・ジャコブ

Sadao, also known as the Demon King from Ente Isla, was compelled to withdraw due to his confrontation with the Hero Emilia and humans. As a result of this encounter, he found himself in present-day Japan alongside one of his generals, Ashiya, transformed into human form. In order to survive, Sadao took on part-time employment at MgRonalds before eventually being promoted from a temporary worker to a full-time employee.