The World Government executed Gold Roger, also known as the "Pirate King," a notorious figure who sailed the Grand Line. This event triggered a global shift, and the revelation of One Piece, a treasure with unlimited riches and fame, sparked the Grand Age of Pirates. Monkey D. Luffy, a 17-year-old boy, sets out on a journey as a pirate, driven by a desire for adventure and the promise of discovering the ultimate treasure.