In a world contaminated with toxic fungi, a discarded maintenance robot finds a girl named Toriko on the brink of death among the discarded junk in a junkyard. After nursing her back to health, it is revealed that she may be the last remaining human and is highly vulnerable to the deadly conditions of the outside world. To ensure her survival, the robot and his newfound friend, a decommissioned AI known as factoryAI, creates a refuge for her within a terrarium. To reinforce the terrarium as well as Toriko's poor health, the lone robot must venture into the wasteland to gather resources while battling the vagrant machines and mutated creatures that roam there. Along the way, the uncertain future of Toriko's existence, and the entire human race with her, will slowly come to light.