Zuru, a young girl, embarks on an expedition through a post-apocalyptic city dominated by machines, desperately searching for food. The situation turns dire when her team accidentally activates the city's AI defense system, the Safeguard. As the machines attack and her companions face imminent annihilation, a mysterious man named Killy appears and eliminates the hostile units. Despite his heroic intervention, Zuru remains wary of Killy and questions his intentions. He explains that he has come from thousands of levels beneath the city to locate humans with Net Terminal Genes—a trait that could enable humanity to reclaim control of their civilization and deactivate the Safeguard. After hearing his account, Zuru and her team join Killy, setting out on a quest to find the Genes, which may represent mankind's final chance for survival.