It looks very interesting... Im searching the net for info about it but cant seem to find a thing. The pictures of the cards are awesome though. Hopefully ill find some info on it tomorrow. I'm too tired right now. -.-
A link to this was at the bottom of the wiki page, but as i said before, I'm too tired to read it now. There may be useful info in here though.
http://www.asahi-net.or.jp/~xs3d-bul...ta/karuta.html
Be careful, it looks like there is a lot of different versions of it that may not be what your looking for.