On 9 August 1945, the atomic bomb in Nagasaki, Japan, killed 190 000 people. The tragedy left a deep wound in people's memories that has not yet healed. In the film, Noriko returns to Nagasaki after twenty years to sell her parents' home. She speaks to hibakusha survivors of the explosion, who are discriminated against by society, and whose stories and memories are horrifying. The mourning, guilt and shame of talking about what happened still weigh heavily on their lives. In the poetic and deceptively calm frames of the film, there is a deep and repressed grief that is touched by the unexpected discovery of Noriko's mother's letters.