Comet in Moominland

Comet in Moominland is a Dutch-Japanese anime film by Telecable Benelux B.V. The film is based on the novel of the same name by Finnish illustrator and writer Tove Jansson, originally published in Swedish. It was the first full-length Moomin film, and serves as a prequel to the 1990 anime series Moomin, introducing characters that would later appear in the series. It was released in Japan first theatrically on August 8, 1992 as a triple-feature with two unrelated shorter films, and was later released on home video with 10 minutes of extra footage.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.