Well, I'm sure it's not NYC, just look at the plants and palmtrees. If it's US it's rather California than NYC. But could it be Okinawa arranged as US?... I guess it could, becouse putting a mailbox and a streetsign is no problem, but that restaurant? And there's a lot of non-Asians... 0.o
EDIT:
I've finished watching it and.... Lol, they spent so much money (it looks like it) and time to film it and the effect is... not even medium. The PV is pretty lame-ish. Gosh, it hurts so much, it could've been better!
If they have American restaurants in Okinawa, than I'd guess it's Okinawa...