Amaterasu Takahashi has spent her life grieving for her daughter Yuko and grandson Hideo, who were victims of the atomic bomb dropped on Nagasaki in 1945.

Now a widow living in America, she believes that one man was responsible for her loss; a local doctor who caused an irreparable rift between mother and daughter.

When a man claiming to be Hideo arrives on her doorstep, she is forced to revisit the past; the hurt and humiliation of her early life, the intoxication of a first romance and the realisation that if she had loved her daughter in a different way, she might still be alive today.