Bit late to answer this, but there is a Steam site for VV Prism and one can only access the store page from the supported Asian countries, the community is open to everyone tho.

1. The game can be gifted to other regions but people in Europe keep getting price difference errors and can currently not obtain the game via gift. American users seem to be able to be gifted the standart edition.

2. It is possible to buy a physical collectors edition at Amazon Japan and have it ship to you on release day. This is extremely expensive and will take a while.

3. Some EU people such as myself are banking on code selling websites after release. Fingers crossed someone gets them in. Legit websites disclaim that they first have to test if these codes are working cross region before putting them up.

4. Some people already resorted to the extreme (and illegal) action of changing their store region for three months with VPN and paying for the game with Japanese gift cards. I can't recommend doing that though since it puts your whole account at risk of being sanctioned.