Kokoro, a middle school student, is forced to shut herself off from the world at home because of a psychological trauma. One day, the mirror in her room begins to glow, and a mysterious girl wearing a wolf mask pulls Kokoro into a world behind the looking glass in search of a magical key that can grant one cherished wish. Finding the key isn’t easy—and after five in the evening, the Wolf comes out to hunt in the castle on the other side of the mirror…