A Sacred Fox is the familiar of Ichiro Lucifer in Highschool DxD Rise of the Heavenly Dragon. He receives it from the mother of the sacred fox after he goes into the familiar forest. Sacred foxes are the most rarest kind of familiars and monsters. They have the ability to change their shape and form to give them control over a different element. They have the ability to look human or stay a fox at will but only one is born each year making it hard and impossible to find one. Ichiro Lucifer's familiar goes by the name of Yukina and has eight different forms. So far she has only been able to change form from her normal form one time per day.