Centuries after toxic mycelium poisoned the atmosphere and ended humanity, a robot named Robbie discovers Toriko—a lone surviving girl—in the ruins. With the help of factoryAI, Robbie builds a terrarium to shelter her, battles fungoid diseases, and fends off those who would destroy Toriko to prevent humanity from returning. After factoryAI is shut down and the immediate threats are overcome, Toriko finally seems safe—until a new illness begins claiming her body, unlike anything she has faced before. With no known cause or cure, Robbie and factoryAI search Toriko's past and humanity's lost history for an answer, knowing that every day without one brings her closer to the end.