One Piece: Baron Omatsuri and the Secret Island is an anime film that premiered in spring 2005.

About the production: the story comes from an original script, the film runs about 91 minutes and its current status is "finished".

Its main genres are adventure, comedy and fantasy, with themes such as Pirates, Ensemble Cast, Male Protagonist and Shounen.

On AniList, One Piece: Baron Omatsuri and the Secret Island has an average score of 78%, a very good score, and appears on 34,332 users' lists.

The franchise continues in or follows from: ONE PIECE: Norowareta Seiken and ONE PIECE THE MOVIE: Karakuri-jou no Mecha Kyohei.

The Straw Hat crew obtain an advertisement for a recreational island on the Grand Line run by the Baron Omatsuri. Luffy decides to take this opportunity to kick back and relax. Unfortunately, when they arrive at the island, they are asked to compete in contests through unity for access to relaxation. However, there seems to be a mysterious air on the island, as the Straw Hat Pirates begin to fight amongst themselves, while Robin, Chopper, and Luffy individually search for the secret behind Baron Omatsuri's island. (Source: Anime News Network)

Official synopsis from AniList.