Never heard of K. Kurosawa but like I said I've been trying to watch more Asian horror so maybe I'll check out "Cure".
Yeah as has been pointed out in this thread, horror is possibly the most difficult film genre to define. "Hausu"'s take on the haunted house flick goes far past mere subversion and I'd agree that it's sort of in its own category. I'm pretty comfortable calling "Possession" horror though. It may be another film that's difficult to compare to anything else but there are enough connections to psychological horror like "Repulsion" and sci-fi/body horror a la early Cronenberg to make the term seem appropriate