The series begins with the execution of Gol D. Roger, a man known as the King of the Pirates (海賊王 Kaizokuō).
Just before his death, Roger announces that his treasure, the One Piece (ひとつなぎの大秘宝 (ワンピース) Wan Pīsu), will be up for the taking, causing the Great Pirate Era (大海賊時代 Dai Kaizoku Jidai) to begin.
As a result, countless pirates set out to the Grand Line to look for the treasure...
Twenty-two years have passed since Roger's execution, and Monkey D. Luffy, a young pirate inspired by Red Haired Shanks, has since set off on a journey from the East Blue Ocean to succeed Roger and find the legendary treasure.
He organizes and leads a nine-member crew named the Straw Hat Pirates. Each crew member Luffy encounters eventually become his close friends, which are including:
- The agile swordsman - Roronoa Zoro,
- The intelligence navigator cum thief - Nami,
- The clumsy sniper - Usopp,
- The womanizing chef and kicking expert - Sanji,
- The humorous doctor and anthropomorphized reindeer - Tony Tony Chopper,
- The sexy archaeologist - Nico Robin,
- The cyborg shipwright - Franky, and
- The talented musician skeleton - Brook.
Together, they sail, fight and searching for the greatest "One Piece"...