Himitsu no Akko-chan: Umi da! Obake da!! Natsu Matsuri is an anime film that premiered in summer 1989, produced by Toei Animation.

About the production: the film runs about 24 minutes and its current status is "finished".

Its main genres are comedy and mahou shoujo, with themes such as Shapeshifting.

On AniList, Himitsu no Akko-chan: Umi da! Obake da!! Natsu Matsuri has an average score of 57%, an average score, and appears on 339 users' lists.

The franchise continues in or follows from: Himitsu no Akko-chan (Movie).

Everybody goes to the ocean for a summer festival and the guys sneak off to a cursed island.

Official synopsis from AniList.