Strange Circus (2005)

Both are about incest and the insanity it provokes

The erotic novelist Taeko is writing a morbid story of a family destroyed by incest, murder and abuse. Her assistant, Yuji, sets on a mission to uncover the reality of this story, but the reality might be too much to bear.

They give somehow the same vibe.

Both are psychological and have gore.
Also the two gave the idea of what is real and what isn't.
In both of them some characther try to get revenge.

And both have a plot twist