One Winged Demon... Angel of Death... Monster... Those were the t.i.tles he acquired on the day when he descended to h.e.l.l in rage. His sword sung a song of death as he slaughtered countless devils. He was cold, ruthless and dangerous. She was a human who used to look at the moon and long for unknown feelings. She used to have a strange dream of an angel who grew beautiful white wings on his back...