The writer Kenzaburo Oe pours all his special feelings for his son and his personal confusion about his writing career into this novel, while Idan XIII preserves these precious contents to the maximum extent in his films. It was originally a quiet life. After her parents went abroad, my sister was at home alone with her mentally handicapped brother. For her brother's good health, my sister Miyoko took her brother to learn to swim, but coach Zhao Nai had a history with his father. It was a soul-stirring past, and everything was waiting for Miyoko to solve.