Reading you, the grave of the fireflies came to my mind. I don't know why. Maybe because of the dates and because it is a movie.
I have seen few productions of the 2000's, without a doubt, there are very good anime from that period. The few that I watched I liked a lot.
Yes... since it's related to WW2... :) Though this one is an alternative universe. ^^
I've mostly only watched Ghibli and Satoshi Kon movies from this period, so watching this movie confirmed it. hahah Classic anime movies are gems!