The three OVAs were later edited into a western theatrical version known as Urotsukidōji I: Legend of the Overfiend, with much of the more explicit material being removed (continued in the UK and Australia by the BBFC and OFLC who also removed some of the more 'shocking' material). New animation was also added to help with the edits and some of the older animation was cleaned up. Despite the censorship, it still earned an NC-17 rating in the United States.

Planet Earth is not all it seems. It is revealed that humans are not alone and that there are unseen realms running parallel to our own: the realms of the Demons (Makai) and the Man-Beasts (Jyujinkai). To further that, there is a 3000-year-old legend that foretells the coming of the Overfiend (Chōjin)—a being of unimaginable power that will unite all three realms into a land of eternity.

The story follows the exploits of the protagonists—man-beast Amano Jyaku, his nympho sister Megumi and their companion Kuroko—as their 300 year search for the Overfiend takes them to a high school in Osaka, Japan. Their discoveries lead them to two students: shy, lecherous Nagumo Tatsuo and school ideal Akemi Ito. But as the film plunges deeper into the dark and macabre, Amano discovers that the Legend of the Overfiend is not what it seems and that the future of the three realms maybe strikingly different from what he is led to believe...
http://en.wikipedia.org/wiki/Overfiend