In the new world left after the Great War, everything has changed. In the shadow of the huge city of Zalem, hanging in the sky, lies a metropolis where people live amid tons of garbage dumped from above. Crime is rampant here, people are struggling to survive, and biology and technology are fused together. Welcome to Iron City! Dyson Ido is a lonely doctor who repairs cyborgs and tries his best to help the people of Iron City. But Ido leads a double life, because he can’t forget why he ended up here, below, in the middle of this huge landfill. Hugo, a young man who makes a living from petty thefts, decides that luck has smiled on him, but what seemed like a profitable scam unexpectedly leads Hugo to secrets hidden in his own past. Vector, the most powerful businessman in the city, wants to take possession of a new technology that can give him unlimited power. None of them yet knows that soon their paths will converge, and the world around them will change forever.