Mudazumo Naki Kaikaku: The Legend of Koizumi

Also known as:  The Legend of Koizumi, Reform Without Wasted Draws: The Legend of Koizumi

The OVA adaptation Mudazumo Naki Kaikaku: The Legend of Koizumi was produced by TYO Animations, based on a "politics x mahjong action" manga also known simply as The Legend of Koizumi - since the main character is based on Japan's ex-prime minister, Junichiro Koizumi. In this political parody, Koizumi plays a special form of "mahjong diplomacy" against foreign adversaries such as George W. Bush, Kim Jong-il, Vladimir Putin, Margaret Thatcher, and others. (ANN synopsis)

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Producers, official website and other details: AniDB, ANN, Wiki