One thousand years have passed since the Seven Days of Fire, an apocalyptic war that destroyed civilization and caused an ecocide, creating the vast Toxic Jungle, a poisonous forest swarming with giant mutant insects. In the kingdom of the Valley of the Wind, a prophecy predicts a savior "clothed in a blue robe, descending onto a golden field". The Valley's princess Nausicaä explores the jungle and communicates with its creatures, including the gigantic, trilobite-like armored Ohm. She hopes to understand the jungle and find a way for it and humans to coexist.