Actually knew of this because of a trailer a classmate years back showed for a presentation of sorts (can't remember what for), pointing out where he got his inspiration to be an artist and all that. It was clips of this anime movie and Ninja Scroll, the director's previous work I have seen earlier this year and enjoyed, that he showed. I'm 21 now, but as an 18-year-old, while I knew of works like that, I had never seen anything like it before and I didn't want to see it because of how cautious I am with what I want to see. Well... I still don't like watching anime like that, but I've seen more clips of this and all that, and I didn't find them to be that shocking once I got down to it (it's an erotic horror/thriller movie). I'm sure they were at the time, but now it's a bit... I wouldn't say tame, but it's not that surprising. It's not a hentai, but his works get pretty close to it, to be honest.
Ehh... story wasn't that great, and characters were kinda... meh. Animation is okay, has an interesting and rather unique style, but it's aged a bit (like with Ninja Scroll). I'm sure there are people who hold this with some regard (like the previously-mentioned classmate), but I don't exactly see it. Ninja Scroll I at least did, but not with this one. And it's funny, because Ninja Scroll was made in 1993--this one was back in 1987. You'd think one would have more of a historical significance than the other, but eh.
If you want to go watch it, just be forewarned of the mature content, and of the occasional flashing backgrounds. I can only imagine how bad it looks on the television screen, but it got annoying on the computer screen. So those prone to epileptic seizures should probably avoid it. (The flashing backgrounds probably are part of the reason why the movie's aged in terms of animation.)
Also, the voice actors who played Gennai and Gatomon/Angewomon from the English dub of Digimon are in this movie (as a perverted old man and demon-like spider woman, respectively). Prepare for some wacky imaginations that may ruin your childhood. Or was that just me who had that?