The Japan Book Publishers Association and other publishing sources reported that online piracy of popular Japanese comic books are causing sales to drop.
Popular manga series such as Naruto and One Piece are quickly posted at online websites. There have also been incidents where the manga is pirated and posted online before it was released in stores. In an investigation conducted by Japanese media, over 700 installments of the One Piece series was available for free online.
Sales of comics books in Japan dropped from $4.3 Billion (450 Billion Japanese Yen) to $2.9 Billion (300 Billion Yen) between the years of 2007 and 2011.
Source: “Manga pirated, put online,” Japan News, April 19, 2014.