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Synopsis (from Wikipedia):
One Piece (ワンピã?Eス ) is a Japanese shōnen manga series written and illustrated by Eiichiro Oda. It has been serialized in Weekly Shōnen Jump since August 4, 1997. One Piece follows the adventures of Monkey D. Luffy, a 17-year-old boy who gains elastic abilities after inadvertently eating a supernatural fruit, and his diverse crew of pirates, named the Straw Hat Pirates. Luffy explores the ocean in search of the world's ultimate treasure known as the One Piece and to become the next Pirate King. On his journey, Luffy battles a wide variety of villains and makes several friends.
Since its release, One Piece has become the most popular manga series of all time in Japan and one of the most popular manga series worldwide. It is the highest-selling manga of all time in the history of Weekly Shōnen Jump, as well as currently being its most acclaimed manga. One Piece is currently ranked as the best-selling series of all time in manga history. It enjoys a very high readership, with more than 240 million volumes of the series sold by 2011. One Piece has received wide critical acclaim from reviewers, primarily for its art, characterization, humor and story.