Shigeru Mizuki's Showa is an epic four-volume graphic novel series about the Showa era of Japan (1926-1989) and a semi-biographical account of Mizuki's own life during that period. It's funny, heartbreaking, illuminating, beautiful, and complex, and it shows why graphic novels are such a powerful and important medium. We talk with Dr. Maryanne Rhett about using graphic novels in the classroom and some of her favorites.