"In a perfect world, imperfection is original sin."
In 2087, "New Era City" - a cyberpunk city covered by a giant dome. The city is managed by an AI "matrix" that monitors citizens' emotional index in real time through a brain-computer interface. Anyone with excessive negative emotions will be labeled as a "Rust" and sent to the "Scrap Iron Area" of the underground city for isolation.
It appears to be a utopia, but in reality it is a sophisticated spiritual prison.