Reika is Motoki's girlfriend. She appears only twice in the anime series, and is the reincarnation of the Great Youma Rikokeidā. In the anime, she leaves Japan twice in order to study abroad, resulting in a long distance relationship between herself and Motoki. The second time, she leaves the country for ten years, but Motoki is still willing to wait for her. In the manga, Reika does not leave the country and simply attends KO university with Motoki. She also meets Setsuna Meioh there and becomes friends with her.