Bobo-kun is an anime film, produced by Studio Ghibli.

About the production: the story comes from an original script, the film runs about 1 minutes and its current status is "finished".

Part of a series of animated short films shown at the Ghibli Museum in Mitaka called "Film Guru Guru". A short film of a fire demon called "Bobo-kun," eating one piece of coal after another. This character would later be re-used as Calcifer, who appears in Howl's Moving Castle.

Official synopsis from AniList.