Emilia is the hero with thigh-length magenta hair who fended off Satan. After forcing Satan to retreat from Ente Isla, Emilia Justina follows him to modern day Japan to ensure that he is destroyed. Like Maou, she loses most of her magical powers upon her arrival and is forced to assume a Japanese name, Emi Yusa, and find employment as a call center agent. Her father was human and her mother was an archangel. However, during her childhood, Lucifer, one of Maou's generals, led an army of demons to attack her village, resulting in the death of her father. This is revealed to be the reason she wants to kill Maou. However, it was later revealed that her father was alive. Emi is later fired from her job at the call center and gets a new job at MgRonald where she works with Maou and Chiho. She also later develops feelings for Maou in the light novels.