Well, I can answer that. There's a lot of differences between the movie and the book. First, I think the movie is trying to summarize books 1 to 6. After that, there is 6 or 7 books about the Akira Empire, in a post-apocalyptic world where Akira is the Emperor and Tetsuo, his first advisor or something. And there's also new characters such as Lady Miyako and an American Soldier on a Secret Mission. You should read the books if you have the chance.