A 16-year-old aspiring military physician at the time of the bombing, Yoshiaki was a student at Kamo Kaigun Eisei Gakko, a school that produced nurses, doctors and other health professionals for the Imperial Japanese Navy, located in what is now the western Japan city of Higashihiroshima. Several days after the atomic bombing of Hiroshima, Yoshiaki was dispatched by his school to the city center in a truck, where he took part in the rescue of those who suffered injuries, and in the process was exposed to radiation from the bomb.