A childlike snow demon she is Miyus rival who seeks to destroy shinma believing Miyu is not fit to do the job. She is less sympathetic than Miyu and is known to kill innocents who get in her way of destroying shinma. Reihas father was the head of a group of shinma protectors whose task was to ensure that a guardian in this case Miyu would emerge. When Reihas father was struck down by the Bird Shinma Black Kite he called out Miyus name instead of Reihas before he died. Reiha has never forgiven Miyu for this.