One Piece Strong World 0 is a prologue chapter written as a standalone story and published in Weekly Shounen Jump. It serves as a special prequel to the 10th One Piece movie, Strong World, and is set 20 years prior to the current timeline of the manga. The story primarily explores the dynamic between Shiki, the Golden Lion, and Roger, the Pirate King, but also delves into the activities of other characters from two decades earlier.