Hotaru no haka (1988)

Grave of the Fireflies tells the tragic tale of two Japanese orphans during the last days of World War II. While history has been faithful in telling the stories of the victims of war on the winning side, it has often neglected the innocent victims on the losing side.

Depicted in beautiful Japanese animation, we are thrust into the towns the allies firebombed. The two children, Seita (10) and his sister Setsuko (4), use whatever skills and resources they can muster in order to survive while adults around them struggle too. Ultimately, the story spirals into despair and loss. We are soberly reminded that this is the plight of war orphans around the world, throughout history and today.

IMDB