I used that one for a few minutes. I found that it "broke" the flow of the scenery of the game, so I tacked on the Shiranui transformer, .. or at least the one I think was the Shiranui transformer, and am content with it now.

I find myself doing battles just for the demon fangs at this point, really. I can't wait to get to the third spider gate to let the money roll on in. I used all of my money on the last merchant before the final boss, and finished the game with about seventeen hundred thousand yen. That was kinda weird.