When Amaterasu Takahashi opens the door of her home to a badly scarred man claiming to be her grandson, she doesn't believe him. Her grandson and her daughter, Yuko, perished nearly forty years ago during the bombing of Nagasaki. But the man carries with him a collection of sealed private letters that open a Pandora's box of family secrets Ama had sworn to leave behind when she fled Japan. She is forced to confront her memories of Nagasaki in the years before the war: of the daughter she tried too hard to protect and the love affair that would drive them apart, and even further back, to the hurt and humiliation of her early life when Ama first learned that a soft heart was a dangerous thing. Will Ama allow herself to believe in a miracle?