Across the expansive desert that was once the Atlantic Ocean; many human settlements have formed around what small amounts of water remain on Earth. There, the survivors live their lives in constant fear of attacks from deadly animals, raids from bandit tribes, and worse: The Seraphinians; who dried up the oceans of the world to find and wipe out their cousin race, the peaceful Atalayans. Sam, who lives with his Godfather, Siward, in a small settlement called Levee, is... different. Since he was a boy, Sam stood out from his peers. He had always been much stronger, and larger, than anyone else his age. When a caravan arrives in Levee, Seraphinian activity suspiciously increases, and Siward appears to be hiding something from his Godson. As the Seraphinians spread out across the human settlements, recruiting laborers to mine in their oil fields, Sam discovers a strange and powerful secret that could change him, and the face of the world, forever.