In the Kingdom of Oura, your soul is weighed by the gold in your pocket. The "High-Bloods" float in the sky-cities, breathing purified air and playing God, while the "Low-Bloods" crawl in the mud of the Slums, mining the very crystals that keep the cities afloat.
Han-wool is a "Rat"—a scavenger with a foul mouth and a lethal swing. He doesn't want a revolution; he just wants a warm bowl of rice and for his sister to stop coughing up blood. But when he finds a "Core" dropped by a fleeing Noble, he becomes the most wanted man in the world.
He's not a hero. He’s a peasant. And he’s about to make the High-Bloods bleed just as red as the rest of them.