Aborigines from distant Terran differ from people in their ability to transform their bodies. They may grow claws or gills. But transformation is painful and bound by a code of social restrictions. Only three times in your entire life can you seriously transform yourself, otherwise you will die - the elders instill in the young. Their power is based on the fear of an almost undeveloped planet. The aborigines live in a single city and do not know what kind of lands lie around. But a young and curious guy, Onis Vallar, falls from a cliff and, struggling with the flow of water, finds himself in unknown lands...