Medical student Yoji becomes one of the thousands of victims of the US atomic bomb attack on Nagasaki in August 1945. His death leaves his mother Nobuko - who works as a midwife - living at home alone, albeit with regular visits from Yoji’s fiancée Machiko. Years after Yoji’s death, Nobuko is unexpectedly visited by the ghost of her son. The brief but irregular ghostly visits prove a source of solace for a lonely Nobuko. However, as time passes, she becomes increasingly concerned about Machiko’s future. Encouraged by the visiting Yoji, Nobuko tries to encourage the young teacher to move on with her life…