A story of two war orphans struggling to survive in World War II Japan, Grave of the Fireflies is one of the most emotionally rending movies I've ever seen, and I can only bear to watch it once every few years because it is so painful to experience. Yet it is for this very reason that this is a film that must be seen. It isn't a happy story, but the protagonists Seita and his younger sister Setsuko do have moments of childlike innocence and joy even as the world around them falls apart. Truly one of the finest movies I've ever seen illustrating the price of war, and easily the most emotionally powerful piece of animation I've ever experienced. Highly recommended.