In a ruined world, humanity clings to survival within the crumbling walls of Panceia, the last city on Earth. Abandoned by the planet they once ruled, every remaining human has been gathered here—every one, except Airot. When Airot, the final outsider, enters Panceia, he receives an unthinkable offer: a deal from Earth itself. Chosen as Earth's emissary, Airot is thrust into a deadly conflict, pitting him against his own kind. Within the city’s fractured society, alliances form and betrayals loom as the defenders of Panceia stand against Earth's followers. Both sides claim to fight for humanity’s salvation, but Airot must decide where his loyalties lie—and what it truly means to save his people.