Panda Kopanda (Panda! Go Panda!) is a 30 minute movie made in 1972. Miyazaki created the original idea, the script, the layouts, and did key animation, and Takahata directed the film. The story is about a little girl, Mimiko, who was left alone while her Grandma was away. A 1973 sequel, Panda Kopand...

Source: MyAnimeList