In a far-future Earth ruled by the sentient Forest, centuries after genetic experiments on the moon shattered it and let the plants overrun the world, a boy named Agito accidentally wakes Toola, a girl who slept through all of it. He brings her to Neutral City, where the Forest watches her warily: the dormant technology of her era still answers to her, and Shunack, another sleeper from that time, means to use it to turn the world back.