Imagine a world entirely made up of beautiful, natural landscapes. In this world, there are humanoid people, but they all have ears and tails like animals! One day, Eruruu, a boy who lives in a village of marginal region, saves a masked young man laying seriously injured. Fortunately, he narrowly escapes from death, but he has lost his memory. Tuskle, the grandmother of Eruruu, names him Hakuoro. Soon, this encounter will open their lives into a series of dangerous encounters.