I don't know how I've missed this trailer all this time. I just watched the one released by Vagrant.
This series (EDIT: I see it's actually a movie, bummer) looks great. Looks like some really deep drama. No retarded action or mindless fanservice. Just a good story. I can't wait for it to come out, whenever that ends up happening.
"On that distant day, the promise we made can never be."