One Piece Episode 31
Episode 31 adapts chapters 69–71.
The Most Wicked Man of East Blue, Fishman Pirate Arlong · Arlong Park arc
Anime
- Episode 31The Most Wicked Man of East Blue, Fishman Pirate Arlong
Manga chapters
One Pace
- The Adventures of Buggy's CrewCovers chapters 35–75
- Arlong ParkCovers chapters 69–71
- Monsters of the Grand LineCovers chapters 71–73
The details
Episode 31 adapts chapters 69–71. 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.