This manga is an historical piece about the aftermath of the Hiroshima bombing. Obviously, it's not completely uplifting, but it has its moments. Overall, however, I found a lot of it fairly predictable and not all that eye-opening, in terms of giving me some additional historical competence. I was hoping to feel like I'd been to post-war Hiroshima after reading this, but I just felt like I'd read a comic book. Bummer.
Nevertheless, it's not a complete waste of time. It's cute in parts, touching in parts, and if you're into historical drama, it's worth picking up.