Hiroshima (ひろしま) is a 1953 Japanese docudrama film directed by Hideo Sekigawa about the atomic bombing of Hiroshima and its impact. It tells the story of a group of teachers, their students, and their families in the years after the bomb. In a flashback sequence, tens of thousands of extras from Hiroshima, many of them survivors, helped recreate the "hellscape" immediately following the bombing.The film was based on the eye-witness accounts of the bombing's child survivors compiled by Dr. Arata Osada for the 1951 best-selling book Children Of The A Bomb: Testament Of The Boys And Girls Of Hiroshima (Genbaku no ko). Produced with the backing of the Japan Teachers Union, the film's "anti-American" stance and graphic content prevented it from gaining a wide release. It fell into obscurity, but has resurfaced in the late 2010s. Many of the cast and crew went on to play important roles in post-war Japanese cinema.