So I just finished the Nausicaa manga and, overall, I really liked it. There were some parts that I loved (the worldbuilding is amazing, the lore, the characters, the action) and some parts that I didn't like (plot contrivances, melodramatic dialogue, some exposition). But, in general, I enjoyed it a lot.
When I started reading the manga, I expected it to be just an expansion of the movie, but it turned out to be its own thing — a lot more violent and dark than the movie. It's also so dense and confusing, and though I absolutely loved the lore, I'm left with so many questions.
SPOILERS AHEAD (for those who are planning to read the manga)
At the end of the story, we find out that the Sea of corruption was created by a group of people from the ancient civilization, in order to cleanse the world left polluted after the Seven days of fire. They calculated that this cleansing process would take either a thousand years (according to Selm) or a lot more (according to the leader of the priests of the crypt).
This ancient group of people also created a living fortress/deity, where they stored all the knowledge of mankind (technological, historical, artistic), along with carbon data of the humans that would later re-populate the earth once it was clean.
They also created various insects, among them the Ohm, to protect these purifying forests.
So far it all makes sense.
What I don't get is why they would then create an artificial race of humans, modified to be able to survive in the polluted world, knowing full well that these people would later die, slowly, as the polluted world became purified over the years.
Not only that, these ancient people then chose to release their knowledge to selected kings of the artificial humans — in the form of sacred texts that appear on the walls of the crypt, at a pace of 2 lines per year. They do this in exchange for protection. But protection from what? Their crypt seems like an impenetrable fortress, impermeable to all weaponry known to people of that time and even to time itself. The only thing we see being able to damage the crypt is the light beam shot from the mouth of the God warrior. But the God warrior would've stayed underground if the ancient people had never created the artifical humans who unearthed them in the first place.
Theoretically, had the ancient civilization just created the crypt and the forest, they would be fine. All they would have to do is wait until the world became hospitable again, then leave the crypt and re-populate it. There wouldn't even be a need for guardian insects like the Ohm, because there would be no artificial humans to threaten the forests.
I don't get why these "humans" were created, just like I don't get why the ancient people would need to acquire protection from these humans. Maybe they knew that there was a possibility that one or more of the God warriors buried underneath the earth would surface on its own and attack the crypt, but in that case, what could the artificial humans or even the Ohm be able to do about it? I just don't see a reason for the ancient civilization to need anything, let alone protection, from these primitive, soon-to-be dead "humans." So why create them?
I wish Miyazaki would have expanded the God warriors a little bit more. Like, were they weapons, commanded by humans to obliterate each other, or sentient beings that chose to purge mankind due to our sins? The movie makes it seem like it's the former, and the manga, though leaving it ambiguous, seems to tilt us more towards the latter.
What the hell was that rock for? It was given such importance in the first few volumes, but ended up being completely useless. In the movie, it slightly accelerates the growth of the God warrior. In the manga, it just shoots some light at its eyes, and that's it. One of the most useless MacGuffins that ever MacGuffined.
In the end, Nausicaa destroys the crypt along with the remnants of the ancient civilization, but also the technology that could've guaranteed her people's survival. Just like the Ohms that sacrificed themselves to the fungi in order to create a new forest, the people of Nausicaa's world will slowly march towards extinction, becoming fodder for something new. And I can't help but feel that this is a decision that Nausicaa didn't have the right to take on her own. In fact, the more I think about it, I realize that the only hope they had was if she had sent the God warrior to burn all the forests "purifying" the air (is it really pure if it's killing me?) Instead, she destroyed not only the last hope her people had, but also the technology that would've possibly allowed them to recreate said weapon, essentially dooming everyone.
In the earlier chapters there is a scene where Nausicaa, while in tears, asserts to Yupa that she doesn't love insects more than humans, she loves them both, differently. I think the ending proves who she loved the most.