|Full Name||Itsuwa Mio|
|Novel||Volume 11, The Ojou-sama's Magnificent Day Off|
Mio and Hirofumi live together because he started attending the Magic University there after she graduated. He also takes care of her.
Mio treats him with the utmost respect during their conversation at the Saegusa Manor.
Mio and Mayumi get along and act respectfully towards one another during her visit at their Manor.