What is the fine-grained topic of the following text: Learn about the background to this story of Copel-kun learning to think for himself with the guidance of his uncle and through experiences with his friends; the portrayal of a rapidly changing society in 1930s Tokyo; and how the work has evolved since it was first published as a children's book in 1937 through to 2017 when it became a best-selling manga. Only return the topic.
The evolution and societal impact of Copel-kun's story from its initial publication in 1937 to its success as a best-selling manga in 2017.