According to Japanese tracking company Oricon, who tracks the physical releases of media in Japan, with the release of the historic 100th volume of the One Piece manga, all 100 volumes have physically sold 1 million copies according to the platform, all well as had 50 of the last 51 volumes debut at 1st place on the manga ranking charts, with only JUJUTSU KAISEN’s 16th volume ranking above One Piece’s 99th volume earlier this year.
In total, One Piece has printed (physically) and sold (digitally) at least 490 million copies around the world.
Attack on Titan is also the second-most series with each volume over 1 million copies sold at 34 volumes, Naruto at 3rd place with 31 volumes, Haikyu!!