Search it online
Unfortunately, no. It's a Japanese game, so you'd have to order it from either Japan or Korea online. Project Diva has never been translated into English officially, so it wouldn't be for sale in English-speaking countries.
There is no manga for the game Project Diva. However, there is a manga based on the same characters as Project Diva called Hatsune Mix.
You have to have the original Project Diva and a PSP with the game in it connected via USB to a PS3 with the software installed to play Project Diva Dreamy Theater.
You can buy it at Playasia.com
No Japanese PSP game
yes
you're able to get a free download of project diva on 4shared, but you would have to make a free account. I just downloaded mine and it's just amazing.
Project diva one has songs mostly featuring Miku. There are only about 4 len/rin cover songs on there. Also most of the models are Miku. In PD2, They focus on Luka, miku and len/rin. Also, the arrows and a "hold" not was added.
By "the new game", I suppose it's Project Diva 2nd. Unfortunately SEGA won't release the game in English version because VOCALOID is not so popular outside Japan.
Sadly, no there is not. It's only made for PS3 and PSP.
Its just for psp. :D