This anime is great, but can only be endured once. The animation is certainly sub-par and very dated, since this was made in early 80s, but it's the story of survival during and after the effects of the nuclear bomb that was dropped on Hiroshima that makes this a must-see film. The story is based on the experiences of an actual Hiroshima survivor. A warning though, even though its an animated film, it is certainly NOT for kids and many scenes of dead and dying people is hard to watch.
It compares best with Grave of the Fireflies, but it's not as good as that one, both story point of view as well as animation.
8/10