Japan and the United States ar at war. To force a Japanese resistance, the Americans choose to use atomic weapons. They drop an atom bomb named Little Boy on Hiroshima on August 6, 1945, then a second bomb, Fat Man on Nagasaki on August 9, 1945. The temperature at the centre of the explosion that razed Hiroshima rose to 300,000°C. The number of people killed by the blast, the heat and the subsequent fire storms is difficult to determine, approximations range from 110,000 to 250,000 dead. Tsutomu Yamaguchi survived both attacks.