I'm confused. You want to write an amusing story about a game you've never played, which you don't want to play, and without any first-hand knowledge or experience of it?
Hmm.

Renting FFX-2 would give you some half-decent impressions, but that game's true depth is hidden quite well. You could finish the game during a one-week rental, but you'd get nowhere near unlocking all the secrets and back-stories.