The Grave of the Fireflies

I've always admired the technique of Japanese Anime, but rarely cared much for the stories it's used to tell. This movie tells a marvelously heartbreaking story about two Japanese children who's parents are killed in an American attack during World War II.
It's a very serious story, which separates it from most animation. But I think the fact that it is animated allows the viewer to see the story of these doomed children with a child-like perspective, instead of showing gritty realistic imagery. Very moving.