Is Mudazumo Naki Kaikaku: The Legend of Koizumi hentai?
No
Rated R (17+ (violence & profanity)) on MyAnimeList and not tagged as Hentai.

OVA · 2010 · 3 episodes · R - 17+ (violence & profanity)
Comedy, Parody, Seinen, Strategy Game
Global political figures such as The Pope, Kim Jong Il, George W. Bush and recent Japanese Prime Ministers play riichi mahjong against each other.
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