"What does it mean to be human?" River always wondered. Ever since he was picked up in a river one day by a woman called "Moma", he and the people around him have always wondered what he is and where he came from. Living in a village that's creature friendly, he wanted to know the difference between a human, a creature and whatever he is. Furthermore, can all humans and creatures live in peace like the village he grew up in or will a wickedness erupt from it? Is the human experience really that great?