What if this was the final lesson you would ever teach? What would you say? Atomic bomb survivor and former elementary school teacher Kajiya Fumiaki, age 85, holds a special class at an Osaka elementary school. He was six years old when the bomb fell, at school just 1.8 km from the epicenter. His sister, who was with him, was killed. Kajiya uses a picture-card show he drew himself to explain what happened that day and brings a special object to share with the class. With an operation for bowel cancer looming, what final lesson will Kajiya teach the children?