This short story actually came out two months ago — I’m terrible at updating things.
As the Last I May Know, at Tor.com
The story is inspired by one of the poems I read in the Nagasaki museum, by Atsuyiko Matsuo, who lost his wife and three children in the destruction. It’s haunted me ever since, especially these lines:
After losing everything.
I stand holding
four atomic bomb death certificates.
I’ve never forgotten it.
The death toll within a kilometer of the Nagasaki hypocenter was 100%.