Oh, right! Tifa nearly forgot that Aerith was new here. Tifa went ahead and explained everything she knew about Paixao, how it seemed to be a floor inside of a giant castle, how people from all sorts of worlds came together from different times between life and death, and how there seemed to be a City Hall with villains and an Organization XIII that seemed to be causing trouble everywhere it went. "I know it's a lot to take in..." Tifa attempted to soften the onslaught of information. "I don't understand all of it, either."
I'm going to take the lazy way out on this one. I hope that's okay.