One Piece

One Piece is a Japanese manga series written and illustrated by Eiichiro Oda. It has been serialized in Shueisha's shōnen manga magazine Weekly Shōnen Jump since July 1997, with its individual chapters compiled into 103 tankōbon volumes as of August 2022. The story follows the adventures of Monkey D. Luffy, a boy whose body gained the properties of rubber after unintentionally eating a Devil Fruit. With his pirate crew, the Straw Hat Pirates, Luffy explores the Grand Line in search of the deceased King of the Pirates Gol D. Roger's ultimate treasure known as the "One Piece" in order to become the next King of the Pirates.

The manga spawned a media franchise, having been adapted into a festival film produced by Production I.G, and an anime series produced by Toei Animation, which began broadcasting in Japan in 1999. Additionally, Toei has developed fourteen animated feature films, one original video animation, and thirteen television specials. Several companies have developed various types of merchandising and media, such as a trading card game and numerous video games. The manga series was licensed for an English language release in North America and the United Kingdom by Viz Media and in Australia by Madman Entertainment. The anime series was licensed by 4Kids Entertainment for an English-language release in North America in 2004, before the license was dropped and subsequently acquired by Funimation in 2007.

One Piece has received praise for its storytelling, art, characterization, and humor. It has received many awards and is ranked by critics, reviewers, and readers as one of the best manga of all time. Several volumes of the manga have broken publishing records, including the highest initial print run of any book in Japan. In 2015 and 2022, One Piece set the Guinness World Record for "the most copies published for the same comic book series by a single author". It was the best-selling manga for eleven consecutive years from 2008 to 2018, and is the only manga that had an initial print of volumes of above 3 million continuously for more than 10 years, as well as the only that had achieved more than 1 million copies sold in all of its over 100 published tankōbon volumes. One Piece is the only manga whose volumes have ranked first every year in Oricon's weekly comic chart existence since 2008.

The world of One Piece is populated by humans and many other races, such as dwarves, fish-men, and giants. It is covered by two vast oceans, which are divided by a massive mountain range called the Red Line; The Grand Line, a sea that runs perpendicular to the Red Line, further divides them into four seas: North Blue, East Blue, West Blue, and South Blue. Surrounding the Grand Line are two regions called Calm Belts, similar to horse latitudes, which experience almost no wind or ocean currents and are the breeding ground for huge sea creatures called sea kings. Because of this, the calm belts are very effective barriers for those trying to enter the Grand Line. However, navy ships, members of an intergovernmental organization known as the World Government, are able to use a sea-prism stone to mask their presence from the sea kings and can simply pass through the calm belts. All other ships are forced to take a more dangerous route, going through a mountain at the first intersection of the Grand Line and the Red Line, a canal system known as Reverse Mountain. Sea water from each of the four seas runs up that mountain and merges at the top to flow down a fifth canal and into the first half of the Grand Line, called Paradise because how it compared to the second half. The second half of the Grand Line, beyond the second intersection with the Red Line, is known as the New World.