The Mafu Cage

The name of this movie is The Mafu Cage released in 1978-01-01 and it's main theme is Two strange sisters live in a crumbling mansion, where they keep a pet ape, which belonged to their late father, locked in a cage. While one of the sisters seems to be keeping her head on straight, as it were, the other appears to be sinking further and further into barbarism and insanity..