Aizetsu is a sorrowful demon girl, always having and dejected expression on her face. Aizetsu has black shoulder-length hair, blue eyes and blue sclera, a pair of white horns and black veins on her forehead and under her eyes. Sekido is an angry demon girl, always with an irritated expression on her face. Sekido has the same appearence as Aizetsu, but Sekido has red eyes and red sclera. Both of them are 200 years old demon girls.