Our story begins in a settlement known as The Valley of the Wind. The people have been able to survive for centuries without too many conflicts with the Toxic Jungle. But now their troubles have just begun when aircraft from Tolmekia crashed into the Valley. Aboard the Tolmekian aircraft is the embryo of a bioweapon of the Seven Days of Fire, Giant Warrior. They discover the next morning via invasion by Tolmekian troops led by Princess Kushana and Officer Kurotowa that they plan to use the Giant Warrior to destroy the Toxic Jungle and become a massive power in the world. Now it's up to the Valley's princess, Nausicaa, to keep the Tolmekians from going crazy and saving not only her people, but the Toxic Jungle as well, a place where Nausicaa searches for solutions for her people to survive and ways to understand the creatures that live in the forest.
I'll get one of the first things that's great about this film out of the way: the animation. Yeah I say that a lot for Ghibli's movies but it's still part of what makes it a good movie. And the images created are just massive. Giant insects, giant aircraft, and it's all so greatly detailed and beautiful and very uniquely designed like nothing I've ever seen before.
Another great thing I really respect this movie for is the message. When I first saw it for the first time in years, I thought it would be as simple as "Don't destroy the environment or each other" or "Keep the peace and avoid war" or some stuff like that. But it's really more than some simple environmental peace-loving message. It's about the connection between humans and nature. Without giving too many spoilers away, there is a reason why the Toxic Jungle exists and why Nausicaa is going to such extremes to save a very hazardous place. Humans can't live without nature. We need it to survive, but also not wipe it out of existence. Even when we create such poisonous environments that will kill us, we need to maintain a connection and understand those environments to learn how to survive.
Great message, great characters, great story, great animation. What more could you want? Go see it.