Directed by Isao Takahata, Grave of the Fireflies is an animated war film that tells the story of two siblings attempting to survive during World War II. (IMDb)
This is the first feautre film to come out of Studio Ghibli not directed by Hayao Muiyazaki. On top of this, we also find a new genre. Isao Takahata created a war story using the same animation style being popularized in this timeframe.