1940, Kawamoto Akiko lives in Hiroshima with her father and mother, Genkichi and Shizuko, as well as her two younger brothers. Akiko loves playing her favourite piano. As the war situation worsens, she is busy helping out the war efforts. On the morning of August 6, 1945, she disobeys her father and heads into the centre of town for work. In Hiroshima 75 years later, her favourite piano remains, restored and playable following its survival of the atomic bombing.