As detailed in the "The Legend of Koizumi."
http://tvtropes.org/pmwiki/pmwiki.php/Main/TheLegendOfKoizumi
Oh. My. Goodness.
If only real life were like this.
(Language warning for some parts.)
Edit: The former Japanese Prime Minister Koizumi versus Pope Benedict. At mahjong. Benedict himself being chosen as Pope because he beat all the candidates at mahjong.
...
This is the greatest manga ever.
Gotta give this thing props. It took me away from everything else I was doing for like, four or five chapters. I don't even know that much about mahjong, but they made it totally cool with this in only the way that manga can make a game seem like a deathmatch using full cinematic martial arts powers.
THE POPE VERSUS HITLER
And the Nazis are from the MOON
*squee*
I saw the first episode of the OVA anime during a 4 hour filmfest at ACEN last week and was awed. Seeing Koizumi destroy Kimg Jong Il at Mahjong and then ride a harrier into a nuclear warhead was a truly awe inspiring sight.
I was not aware the anime episodes were based on a manga. I shall have to do more investigation.