Hundreds of years after the events of Fainaru Fantajī Shikkusu VI (ie FFIII/FFVI) ,Tina (ie Terra)'s descendants multiply in the World of Unruin like how Abraham's descendants multiplied in Ancient Israel. The World of Unruin is a rebuilt World of Ruin that is more advanced, happier etc than the World of Balance centuries earlier and is made up mostly by Tina's descendants.
One day, Cefca's step son's descendant Karafka, rebuilds the Magitek Research Facility and he then hires some evil workers from the Floating Continent to become facility workers at the newly rebuilt Magitek Research Facility. Karfaka then requires all residents of the World of Unruin who are descended from Tina to come to the Magitek Research Facility to have the facility workers do to them what the facility workers did to the Espers in and before the events of Fainaru Fantajī Shikkusu VI. My view is I am mostly apolitical on whether Tina's descendants should allow the Magitek Research Facility workers to do anything to them, though at times, my view on this is that I don't want any of Tina's descendants to allow the Magitek Research Facility workers to do anything to them ever since like with the Espers centuries earlier, it will cause Tina's descendants harm and suffering. I don't trust the Magitek Research Facility or their workers to do safe things to Tina's descendants.