From
http://natsumemaya.terminus.net.au/news.htm -
The Azumanga Daioh Advance computer game will be released for the Gameboy Advance on 25 April 2003, price 5,800 yen. The game system takes the form of a 'card battle'. In the meantime, a trial version of the game for Windows PCs can be downloaded from this page -
http://www.starchild.co.jp/special/azuma/
azumanga1.html (approximately 780Kb). Just click on the green button in the middle of the page to download, then unzip the file and double-click on the Azutaiken.exe file. Source: Moonphase.
Just some guesses -
Maya beats KuroNeko KuroNeko beats Sakaki Sakaki beats Kagura Kagura beats Maya ??
Tomo beats Yomi Yomi beats Tomo Tomo beats Yomi Yomi beats Tomo... => stack overflow core dump.
The 'Osaka' card negates one random rule.
?? Give up.
Actually, my mind enters a strange Osaka-zone simply trying to grasp an 'Azumanga Daioh Card Battle', really I cannot imagine it.