My mind wandered off wondering if this was a Pantheon of Gods sort of thing? Are they gods of things that happen because they are the god of that thing? If he kills a god, will that thing cease to be (skies, seas, seasons, etc.)? All questions that may make the series far more interesting...
I got frustrated in how to write my frustrations with the narrative that none of her own research got her towards this result, and that it required someone with knowledge of modern industrial machinery that I'm just going to link this instead.
Really seems to me like the plan is to gather all the sexual partners and retreat to a safer location, leaving the rest present to a somewhat known fate...
As one pop song once famously asked -- Why'd you have to go and make things so complicated?
We already had plenty of interesting threads that were tying Japan and this fantasy world together without having to add in "3000 Years Into The Future."