Mio Naruse is a Demon who is the Demon Princess and next in line for the Demon Lord position. She is the daughter of the previous Demon Lord, the late Wilbert, and is the niece of Ramusas. She inherited her father's abilities after his death and became aware of her heritage 6 months before meeting the Toujou family who unofficially adopt her and her retainer, Maria, into their family. Mio became Basara's servant through the Master and Servant Contract. __TOC__