Hiroshima, the movie, is based on a book called "Children Of Atomic Bomb", which is a collection of stories by child survivors of the attack. Ninety thousand Hiroshima residents, many of them hibakusha (a term referring to the survivors of the atomic bombings of Hiroshima and Nagasaki), labour unions and a head of university volunteered to help the pro-peace and pacifist movie to be made as no commercial entity and studio would help or touch it. The Japanese teachers' Union financed the film to promote peace. The film is now restored as best as possible following its rediscovery. It depicts the period during World War II prior to and during the atomic bombing and the physical and societal aftermath.
Set in post-World War II Japan, midwife Nobuko is resolved to move on as she stands at the grave of her son Koji who died, alongside thousands of others, when the Americans dropped an atomic bomb on the civilians in the southern city of Nagasaki. However, upon returning home she is visited by an apparition. which continues to return in order to commiserate and reminisce with the woman about the past, family, affection and war.
The movie focuses on the plight of ten war orphans hailing from different cities across Japan. With nowhere to go, they scavenge around train stations, scratching out an existence by means of black market work for a one-legged tramp whilst avoiding being picked up by the police for vagrancy. Soon however, they find a more inspiring role model in the figure of a nameless soldier just repatriated after the war. An orphan himself, the soldier also has no home to return to, and so sets out across the country with the kids in tow in search of work before settling on the goal of leading them to the orphanage where he himself grew up.