Kagami no Mukou

Rumors say that inside a dusty room in an old manor, a demon inside a mirror can grant any wish in exchange for years from the wishmaker's life. While he is powerful, the demon only seems to grant wishes pertaining to appearance. His sole companion is a young, disfigured girl named Nio who has never asked for anything in return. Intrigued, he asks Nio what her wish is, only to find that her answer is something he cannot quite understand.