As a boy goes through daily life in 1930s Japan, he comes across several experiences that compel him to reflect and think about what it means to be a good human. Copper speaks to his uncle, who writes letters of advice to him in alternating chapters. They discuss art, science, politics, philosophy, and religion. 

A fresh take on these heavy topics, I’ve never read about these things written in a way that is understandable by a child. Great storytelling with a clear “moral of the story” at the end of each chapter. Only complaint I have is how the Uncle makes sweeping general statements and states opinions that I quite disagree with. But I guess it’s useful to note that this book was written decades ago, and was particularly important during its time of publication because the militarisation of Japan was growing and they were heavily censoring anything that criticised the government. Yoshino wrote this for children, to teach them the importance of humanities, morals, to think for oneself and to stand up for what is right. In this aspect, I think the book did a good job.