** Spoiler Alert**
I saw most of the films mentioned above.
But I have to second Grave of the Firelies
In many depressing movies, there are always slight moments of happiness or joy.
However, from the beginning to the end, i can not remember one single scene in Grave of the Firelies that was not depressing.
I swear i flooded the room with tears when i realized the sister will eventually die @ the end.