"Showa: A History of Japan is a four-volume manga series by acclaimed artist Shigeru Mizuki. It intertwines a comprehensive, highly critical historical account of Japan's Showa era (1926–1989) with the author's own autobiographical coming-of-age story. The epic narrative blends two very different visual styles—photorealistic historical backdrops and cartoonish manga characters—to explore the turbulent twentieth century." Although its not too detailed it is enough to understand the main events and weaves an entertaining story with characters that grow on you and gives you some insights that only someone who lived in that time could. Give it a go here and see what you think.
Worth a read for sure,
Brian