
I saw this game mentioned over at insert credit...
http://www.kenkabancho.com/
It is an upcoming PlayStation2 3D Fighter (graphics and game play look like a cel-shaded Spikeout) and the story seems to revolve around that well used manga/video game story line of J high school gangs battling for dominance and probably involves a misunderstood tough guy hero. But to promote the game, they have developed a free, shockwave based, web game, which isn't half bad. It doesn't suck you in like Nanaca Crash, but I found it enjoyable way to kill 5 to 10 minutes.
http://jp.shockwave.com/games/shooting/tsubushi/tsubushi.html