One Piece (ワンピース, Wan Pīsu?) is a Japanese manga series written and illustrated by Eiichiro Oda with an anime adaptation. The series focuses on a ragtag crew of heroic pirates called the Straw Hat Pirates, formed and led by a captain named Monkey D. Luffy. Luffy's greatest ambition is to obtain the world's ultimate treasure, One Piece, and become the Pirate King.