The story centers on an elderly hibakusha, whose husband was one of 80,000 human beings killed in the 1945 atomic bombing of Nagasaki, caring for her four grandchildren over the summer. She learns of a long-lost brother, Suzujiro, living in Hawaii who wants her to visit him before he dies.
A poor village in the Tohoku area has a law that states when a resident becomes sixty years old, they must move to the place called Warabino, far away from home.
