It was an important moment in the twentieth century when the world's first atomic bomb to attack a country or region was dropped on Hiroshima, Japan. It was a scientific, technological, military and political adventure. This documentary attempts to show us what the life of the Japanese people who experienced the atomic bombing is like (there has been no similar documentary before). From the explosion test in New Mexico to the final drop over Japan in just three weeks, we have a chance to see the room where decisions were made, the streets of Hiroshima at the moment of the disaster. The story unfolds with parallel clues.