Natsufuku No Shoujotachi | Girls in Summer Dresses (480p) v2

About 20% is not translated.

In 1945, the second and third-year students of Hiroshima girl's school are taken away to work in war factories. The remaining 220 girls of the first year try to make their best of their new-found status as the only teenagers in an almost deserted town, even amid the deprivations of wartime.

Source: The Anime Encyclopedia

Note: Broadcasted on the 43th anniversary of Hiroshima in memory of "the girls who lost their lives to the atom bomb".