Yukine Amanae

An intelligent and beautiful girl who becomes a serial killer who leaves handmade music boxes after each murder. Yukines motives are largely unknown but she is apparently targeting Kiyotaka and the Blade Children for revenge. She is the sole holder of the Mikanagi File with its information contained entirely in her memory no concrete records of the file exist. Her father Fusai Amanae was a surgeon and her mother was a psychiatrist. Her father as an associate of Professor Isabel Mikanagi was entrusted with information concerning thirteen Blade Children erased from the list of eighty Blade Children held by Kiyotaka the Watchers the Savers and the Hunters. After Mikanagis death the Amanae family fled to Japan with one of the Blade Children a girl named Charlotte. When Charlottes blood awoke murderously Yukines parents and Charlotte were killed in a resulting house fire leaving Yukine the only survivor. When Yukine turned seventeen she inherited her parents bequest Source: The Mikanagi File