
Sadako's best friend told her of an old Japanese legend which said that anyone who folds a thousand paper cranes would be granted a wish. Sadako hoped that the gods would grant her a wish to get well so that she could run again. She started to work on the paper cranes and completed over 1000 before dying on October 25, 1955 at the age of twelve. The point is that she never gave up. She continued to make paper cranes until she died.
"This is our cry, This is our prayer, Peace in the world". Link