The series Sora no Woto was based in a post-apocalyptic world that significantly reduced the technological capability of mankind. (Takemikazuchi spider tanks -> mundane tanks)
Then entire show focuses on events after the apocalypse, with only a glimpse of flash-backs to earlier events during the apocalypse. But for the most part, the apocalypse itself is largely shrouded.
Are there any details about:
- What the apocalypse was?
- How did it happen?
- What did the pre-apocalyptic world look like?