After playing this for a little while, I've come to a couple conclusions:
1) I want to use Niigi Gorgeous Blue
2) Trying to play for score with anything other than Type 1 Kotaro is an exercise in futility
Am I doing something wrong here? I tried out every character but him, and was going to just quit, until I saw what his shikigami does to stuff's faces in the demo.
Anyway:
pierrot - 581,414,260 - Stage 2-1 - Kotaro - Dreamcast
Got hit three times at the beginning of Stage 2; Really not sure what happened. Also, why is the extend so useless when you have all of your lives? Or does it just give you an extra bomb and nothing else, regardless?
Got Shikigami Seijin rank on this one, so that's cool, I guess.
Also, I believe the extends are 400 million and every 700 million after that.