Mio Naruse is one of the main characters in The Testament of Sister New Devil anime. She is one of the two stepsisters Basara Toujou (protagonist) has to accept into his family. There are seemingly normal girls but they reveal themselves as demons. Mio Naruse is the former Demon Lord’s only daughter and her sister Maria is her trusted servant. it becomes interesting because Basara is former member of the Heroes Clan, which are sworn enemies of the Demons. Mio has red hair, violet eyes and large breasts!