Books like A Dictionary of Mutual Misunderstanding

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.