2015 in manga is wrongly remembered to have had only ten mangas come out, one of which was One Piece with 14,102,521 copies and with the most volumes sod.
On June 15, 2015, it was announced that Eiichiro Oda and One Piece had set the Guinness World Record for "The most copies published for the same comic book series by a single author" with 320,866,000 copies printed worldwide as of December 2014. 
