The story takes place in the world surrounded by nature such as forests. In this world, there is the mankind almost looks like the human being, but it has ears and a tail like an animal. One day, Eruru who lives in a village of marginal region saves a masked young man lying serious injured. Fortunately, he narrowly escapes from the death, but he has lost his memory. Tuskle, the grandmother of Eruru, names him Hakuoro. Soon, this encounter will make them lead checkered lives.