Based on Seanchow806's Reformed Earth series.
Link:
https://www.deviantart.com/seanchow806/gallery/82466893/the-reformed-earth-series-section

The story is that a girl (an adopted sister of the main character) is teleported into a continent of Strodas where it is a movie spoof of any media. The main character has the search the entire cotinent for their sister, while the sister discover her lost past and a prophecy.

Should this story arc take place in:

Vietnam Era

21st Century

Post-Great Calamity (Future)