Heidi (1974) Japanese anime series by Zuiyo Eizo (now Nippon Animation) based on the Swiss novel Heidi's Years of Wandering and Learning by Johanna Spyri (1880). It was directed by Isao Takahata A feature-length film Heidi in the Mountains, aka The Story of Heidi, was edited from the series by Zuiyo (which by then was a separate entity from Nippon Animation, which employed many of the TV series' animation staff) distributed in 1979. All cast were replaced excluding Heidi and the grandfather. This movie is also the only incarnation of the Heidi anime to have been released commercially in the United States in English (on home video in the 1980s). Isao Takahata remarked "Neither Hayao Miyazaki nor I are completely related to any shortening version" on this work.

Heidi leaves her beloved Alm and moves to Frankfurt, where she finds a new good friend in Clara. Aunt Dete wants Heidi to leave her grandfather on the mountain pasture and go with her to Frankfurt, where she is supposed to live with the Sesemann family and keep their paralyzed daughter Clara company. In this way, Heidi would enjoy an excellent upbringing and grow up with one of the richest families in Frankfurt. Aunt Dete sees a bright future for Heidi in the city. However, this idea is not met with enthusiasm by Heidi and her grandfather, Peter and his grandmother are also very reluctant to let Heidi go. After much persuasion and many promises from Aunt Dete, Heidi finally leaves her beloved mountain world with a heavy heart and travels to Frankfurt.

Heidi is five years old when her aunt Dete, who has raised Heidi since her parents' deaths four years earlier, takes the orphaned Heidi to live with her formidable grandfather in the Swiss Alps.