One Piece, the beloved manga and anime series created by Eiichiro Oda, has had a long and successful history in the world of animation, which is why the rumors that one of its movies is revenge against Studio Ghibli are so surprising. With the release of its sixth movie, One Piece: Baron Omatsuri and the Secret Island in 2005, fans were treated to a cinematic experience that was exciting, thought-provoking, and entirely unique to the previous catalog of One Piece movies while also potentially being inspired by a distaste for the legendary animation studio, Studio Ghibli.

Directed by Mamoru Hosoda, One Piece: Baron Omatsuri and the Secret Island was a departure from the series' typical shonen action-adventure formula. The film was a psychological thriller that explored themes of power, betrayal, and redemption. While the movie was well-received by fans and critics, it has since been the subject of much speculation and rumor.