The infamous pirate Shiki kidnaps the straw hat pirate crew in his quest to fight the world government, forcing one of them to act as his navigator. The rest of the straw hat pirates must rescue their friend and escape the clutches of Shiki. Strong World can be enjoyed at any time during a watch-through of the anime, but it has the best effect coming after the end of the Little East Blue Arc from the Summit Saga (aka Episode 429).