It is very difficult to decide which ones to include and which ones to exclude, and as preferences change over time and new films are seen this list will also change. A ranking would be too difficult, so the list is in chronological order. As this is a very limited selection, I of course consider all the listed films to be masterpieces of the highest order.
Not (yet) in the database:
Chika hiroba "Underground Square" (Keiya Ouchida, 1969)