From the introduction:
This game was originally based on Toho Curtain Fire Play - flowers, and was an attempt to make the game more playable to English-speaking audiences and to round out the game some more by altering mechanics that were there. Over time it eventually became more of its own game, and I have taken it in that direction without attempting to be faithful to the original game. Danmaku Hanamatsuri is heavy on discretion on the Game Master’s part, although I have tried to ground many things in mechanics that I felt needed to be. If you have any questions or comments about the mechanics, ask your GM first, and if they can’t figure it out please feel free to contact me using the information at the end of this document.
With that said, please enjoy your time in Gensokyo.