One Piece Episode 503
Episode 503 adapts chapters 588–589.
I'm Counting On You! A Letter From a Brother! · Post-War arc
Anime
- Episode 503I'm Counting On You! A Letter From a Brother!
Manga chapters
One Pace
- Sabo's SeaCovers chapters 587–588
- Will of the WindsCovers chapters 589–590
The details
Episode 503 adapts chapters 588–589. Adapting several chapters into one episode is why the anime slowly gains on the manga in raw numbers even while falling further behind in story.