Makoto Shinkai directed "Voices of a Distant Star," which is one of the saddest most thoughtful bits of anime I've seen. "Children Who Chase Lost Voices," isn't in that league but it has moments of real emotion and it has some good action as well. Also it's just plain beautiful so there are no losers here.
The story is about a young girl who gets involved with people coming and going from a lost world. The thing is that there is a myth that the dead can be brought back in this world known as Agartha so people from the surface has always sought it out. Agartha though now is nearly played out, all the past wars has worn it down and even the people have nearly faded away. Can the dead still be brought back to life? Should they?