Hato yo: Hiroshima no Sora wo
Japanese title: はとよ　ひろしまの空を
Type: OVA
Source: Unknown
Episodes: 1
Status: Finished Airing
Aired: 1999
Duration: 21 min
Rating: G - All Ages
Themes: Historical
Demographics: Kids

Based on a book of the same name. 

An anime about the atomic bombing of Hiroshima. The focus is a middle school boy who kept and bred carrier pigeons. While he was out of the city training them, the bomb dropped. Both he and the pigeon desperately tried to find their mother and child respectively in the chaos.