Children's picture book illustrations tell the story of Sadako Sasaki, a Japanese girl who was two years old when the atomic bomb was dropped on Hiroshima on August 6, 1945. Sadako suffered for years from leukemia, attributed to radiation exposure. She kept her spirits up by folding hundreds of paper cranes with the goal of reaching 1000 cranes. She succeeded in folding 644 cranes before her death. Her friends and family continued to make the cranes after her passing. On the anniversary of the dropping of the bomb, thousands of people all around Japan make paper cranes to remember and honor Sadako's courage.