One thousand years after a global war, the seaside kingdom of the Valley of the Wind remains one of the few havens in a ravaged world. Its peaceful existence is shattered when an airship from the aggressive Tolmekian kingdom crashes in the valley, carrying a deadly secret: the embryo of a Giant Warrior, an ancient weapon that caused the apocalypse.
The valley's compassionate and courageous princess, Nausicaä, seeks to understand the toxic Sea of Decay, a spreading forest filled with poisonous spores and guarded by the colossal insect Ohmu. When the Tolmekians invade to reclaim their weapon, they ignite a conflict that forces the valley into a war and threatens to reawaken the planet's doom.
Caught between warring nations and the encroaching fury of the forest, Nausicaä must use her unique bond with nature to prevent history from repeating itself. Her journey becomes a desperate race to heal the rift between humanity and the Earth, revealing the hidden truth of their poisoned world.