On August 6, 1945, this photo was taken after the bomb exploded. The bomb Little Boy was the bomb that decimated. It destroyed an entire city and killed several people and also left thousands of people contaminated with radiation in Japan.
The story behind this photo was that because of a conflict between Japan and the United States that occurred when Japan decided to attack Pearl Harbor Military Base, this attack was a shift from Japan to territorial expansion.
It is with the grudge of Japan that when the war ended, they threatened Japan with the bombs, and as Japan refused, the United States threw the bombs in Japan.