While being raised as a nun of the Catholic Church, Asia Argento a blonde-haired girl, develops her abilities to heal people. However, Diodora Astaroth injures himself and has Asia heal him. As a result, Asia is excommunicated from the church. When she moves to Japan, she befriends Issei, but is abducted by Raynare who steals her rings and kills her. After a lengthy battle, Rias revives her to become a devil and serve as her bishop.