As Squall333 said, its in Ivalice but its compleatly different stories.

If you want to get technical, its between the story of FFT and FFXII. It has the judges from Final Fantasy XII but its still a tactics game. I thought it was alright but you may not like it.

Compared to Tactics, its a tad Childish.
(
Spoiler:
I've never played FFTA2 but if you do and then play war of the lions you can unlock the main charecter from A2 Luso. It will probably impress you more since you will have seen him before.
)