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The Japanese publisher Shueisha produced four million copies of the 65th volume of Eiichiro Oda's One Piece pirate manga — tying the previous volume's record for the book with most copies in its first printing in Japan. The volume shipped on Friday.
The 64th volume set the 4-million-copy record last November. As of the 65th volume, Shueisha has published over 260 million copies of the manga series; One Piece has had the highest number of copies printed of any Shueisha manga series in Japan. Shueisha attributes this to new readers who are buying up the earlier volumes (as opposed to those who shoplift them).
One Piece has been setting records in first printings since volume 56, which held the manga record in December of 2009 for 2.85 million copies. Volume 57 was the first volume to hold the record for all books in Japan, since its 3-million-copy first printing topped Harry Potter and Order of the Phoenix's 2.9 million. Since then, every volume except volume 62 (published two months after the March 11 Great Eastern Japan Earthquake disaster) and volume 65 has set a new record in first printing.
Source: Mainichi Shimbun's Mantan Web