Let the fantasy become your reality.
Have you ever gotten sick of your day to day world, and wanted to explore another one? Ever gotten sick of that one as well? What if you could visit countless worlds, each with different characters, places, and events? What if each world depends on YOU to save it?
This is the idea behind Final Fantasy. Each installment provides an entirely new story and setting. And since the series is already eleven-strong with a twelfth on the way, not even considering the side-stories, what could be better to base a concept around? The possibilities are endless. The only limit is your imagination, and limits can be broken.