In a quiet forest, far from any settlement, there lives a girl named Kuon Magami. Having lost her mother not long ago, she spends her days alone with the wolf pup who is her best friend. But the peaceful times come to an end when a strange pall falls over the forest, bringing with it occasional incursions of dark spirits. Determined to find the source of the problem and stop it, Kuon begins training as an exorcist shrine maiden and sets out to brave whatever dangers lie within the depths of the woods...