hxxp://www.yaoyorozu-kobo.com/soft/tohohana/screen.html
verbatim from dlsite:
Strip hanafuda game, where you have card game with 5 attractive girl characters from the action game Toho. Voices available on the characters, offered by great voice actresses.
This game is only for people who knows how to play Hanafuda game.
If you don't know hanafuda, check this out:
hxxp://en.wikipedia.org/wiki/Hanafuda
hxxp://rapidshare.com/files/19725315/lah_-_hanafuda.rar
94.6 Mb
This is in bin/cue format, so mount with daemon
enjoy