Man, it's amazing how people try to ignore the suffering of others by comparing it to the suffering of others. Let the Chinese mourn Nanking, and let the Japanese mourn their losses. Heck, even for the sins of the Japanese Empire, it's nothing new under the sun, for all lands have played the game of conquest and brought suffering upon their own and others.
I love a good coming of age story with a sad perspective on misplaced nationalism and the horrors of war. (I say misplaced, because these girls love their country and are doing nothing wrong helping nurse the injured and cursing American bombers, which is a healthy nationalism, unlike the war in China.)