In a world ravaged by a biomechanical plague called Rust, humanity huddles in fortified fortress cities. This plague doesn't just take away lives, it grotesquely blends flesh and machinery to create monsters called "rust crawlers." Gu Chuanze, a ragpicker from the slums of Lower City, accidentally activated a dormant pre-catastrophic nano-interface in his body - the "Abyss Code". This interface not only allows him to resist rust, but can even interact with rusted technology and creatures, with the potential to control them. As a result, he becomes a unique being, hunted by a city's dictatorship that fears his power, and attracted by the ever-evolving Rust Creepers. His journey is to uncover the origins of the Rust Plague and the true purpose of the Abyssal Code, while trying to survive the apocalypse and protect the few he holds dear.
