2045, city of Roveast, Nevada (US). Roveast is a modern metropolis haunted by the Wolves, nocturnal creatures with anthropomorphic traits. Wolves show up during the night and are hunted by the Vigilants, hunter-androids, whose purpose is to protect humans against these ferocious beasts. In all this, Isaac is a 25-year-old delivery boy who's looking for his place in the world. Every day that passes weighs more than the previous, and as tensions between humans and Wolves continue to rise, Isaac finds himself devoured by guilt. He might hold the key to solving this never-ending conflict, but the price may be too high.