Top 50 largest publishers in the world (P. 21) - Shueisha Inc. (Japan): One of the leading comic book publishers with stories that have attracted generations of readers
(WorldKings.org) Shueisha Inc. is a Japanese company headquartered in Chiyoda, Tokyo, Japan. The company was established in 1925 as the entertainment-related publishing division of Japanese publisher Shogakukan. The following year, Shueisha became a separate, independent company.
(WorldKings.org) According to moneyinc.com, this is top 10 best-selling manga of all time
(WorldKings.org) According to Statista, One Piece is the best-selling manga of all time, with 454 million units sold as of September