It's honestly amazing, it's so sad, yet amazing! It helps watchers like me grasp the poor Japanese situation during WW2 and the Hiroshima Bombing. We usually see Japan and it's people as having the best life, but they've been through so much. No matter what I say can change how amazing this anime/movie is!
There are also Atrocities to next level committed by Japanese during world war 2 like:
The Rape of Nanking (1937), also known as the Nanjing Massacre
The Bangka Island Massacre (1942): Slaughter of Australian Army Nurses
The Bataan Death March (1942)
The Sandakan Death March (1945)
Murder and cannibalism on the Kokoda Track (1942)
Conscripting women for sexual slavery in Japanese Army brothels (1937-1945)
Mutilation and murder of Dutch civilians in Borneo
Murder and cannibalism - captured American pilots
and also:
Murder of American pilots and aircrew at Midway (1942)
The bombing of the hospital ship Manunda (1942)
The sinking of the hospital ship Centaur (1943)
Extermination of survivors of merchant vessels sunk by the Japanese (1943-45)