August 1945. In a converted theological seminary on the outskirts of Nagasaki, a young doctor works to help his patients, as unsettling news comes of a new weapon used by the Americans on the city of Hiroshima. When the second nuclear weapon is dropped on Nagasaki, the hospital staff must work to save lives in the midst of the concentric circles of death that their city has become.

1940年。 生活在东京墨田区的少女加代子是家中最小的孩子。 她与父母、祖母和三个哥哥过着平静的生活，但日本陷入了战争，一次大规模的空袭迫使加代子离开她的家人和朋友，进行疏散。 而她居住的地方也为越来越多的危险所侵袭。