The Twelve - beings of darkness, mortal enemies of humanity - have been destroyed, their reign of terror is over. The survivors venture out from their walled refuge. On the ruins of their old world, they want to build a new, better society. But in a distant, abandoned city lurks the One: Zero. Father of the Twelve, bearer of the virus. Filled with a thirst for revenge, he intends to wipe out humanity once and for all. Only Amy can stop him now: the girl from nowhere, who has already determined the fate of humanity once before. And so she and her friends prepare for the final great battle between light and darkness...