Xbox 360 exclusive RPG from tri-Ace will be fully localised.
First time Microsoft's console has topped monthly PS3 sales. Wii outsells both combined.
The platform holder's next target is for Xbox 360 sales in Japan to reach one million.
Square Enix says it is undecided as to whether the RPG will also be released on PS3.
Will be appearing on Xbox 360 in 2009.