Scientific experiments that went wrong have brought down civilization in a future world, and most places have sunk back to a tribal way of life. The disaster also changed people for good, dividing them into two species: Machines, who carry mechanical parts, and Beast Spirits, who carry animal genes. Black-Eyed Rock, a Machine, travels the ground between the two races, seeking the truth about this world and fighting for what everyone believes in. The ONA blends action, adventure and fantasy.