The film follows Anna Sasaki staying with her relatives in a town in Kushiro wetlands, Hokkaido. Anna comes across a nearby abandoned mansion, where she meets Marnie, a mysterious girl who asks her to promise to keep their secrets from everyone. As the summer progresses, Anna spends more time with Marnie, and eventually Anna learns the truth about her family and foster care.
This is a lovely, sweet and charming family film. The animation is superb also the soundtrack is beautiful. Another great film from Studio Ghibli.
When possible watch this in the original with subtitles.