There's a video of it available on a one of the Dreamcast Magazine GD Roms (the Japanese magazine). It's a good game, if you like the Harrier series. At the time, the most mind-blowing thing was that the depth of the field was REALLY deep. Way deeper than anything you'd see on Naomi/DC.

As far as I understand, the Hikaru board is similar to a Naomi 2, but has some extra effects (and maybe not as many polygons). The shitty thing is that they were very expensive to make, and you'll almost never run across a used Hikaru board in PCB shops.