Part of a series of animated short films shown at the Ghibli Museum in Mitaka called "Film Guru Guru" . A small white fish enters the frame and is eaten by a larger one, then the latter is in turn eaten by an even larger fish… At the end, only a huge white fish remains which seems to shrink in size. swimming towards the bottom of the screen. He leaves the frame and the cycle resumes.
Watch Sakana no Sakana online — subbed and dubbed, with automatic AniList / MyAnimeList progress sync.