Himitsu no Akko-chan: Umi da! Obake da!! Natsu Matsuri
Japanese title: ひみつのアッコちゃん 海だ! おばけだ!! 夏祭り
Type: Movie
Episodes: 1
Source: Unknown
Studios: Toei Animation
Duration: 24 min
Rating: G - All Ages

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