Graveyard of the Fireflies
Berserk ... bad ending :\ it leaves things unsatisfying.... though its a good story and all it made me go ughh...
I heard Sai Kano once drove a man to suicide...
perhaps a little to dark...and it does shove it way to much, you might find yourself callous to it after a while. It's full title is Saishu Heiki Kanojo by the way...