It's called "A Visual Mix" and is indeed for Japanese PS2. It's basically a 2 disc thing where you can watch the Dome Tour while putting special fx on the screen, or in some cases, moving the camera around her. The other disc is where you can remix like 2 or 3 of her songs.
Basically, if you like Ayu, you'll like this. Don't like Ayu? Pure boredom. Definately for the Ayu fan in you. ^_^
Here's a piccie of mine:
