Imokawa Mukuzo: Chuugaeri no Maki
Japanese title: 芋川椋三宙返りの巻
Type: Movie
Episodes: 1
Source: Original
Genres: Comedy
Duration: 5 min
Rating: G - All Ages

It is most likely a story about a Mukuzo Imokawa doing the somersault.

(Source: Anime Database Wiki)