Yoru is the War Devil and a member of the Four Horsemen. She embodies the fear of War. She poses as a student at Fourth East High School. They do not know that she is a devil. She is of average build and height and has long black hair. There is an added facial scar across the center of her face and left cheek, and her eyes are yellow with multiple red rings within them. When Asa's in control of her body, the scars on her face disappear, and her eyes turn back to their original brown color.