A Boy Named Hiroshima 1987 on netflix

Thirty-eight years after the atomic bombing of Hiroshima, a boy is born with only a single day to live. Named “Hiroshima,” he sets out into the city in search of his mother and encounters a young girl… An independently produced short film created from the desire to let the boys who perished in the atomic bombing see their mothers one last time. By placing the boy in the past and the girl in the present, the film expresses this heartfelt wish.