Demons take multiple forms, in this case there's one thats the mightest of all and has to be satisfied with the flesh of woman. He searches for his preys in the form of a woman, so they won't be feared.
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(Source: Anime News Network)

From the radioactive emptiness of space comes the Demon Beast! A hideous alien monster, the Beast shares a psychic link with the beautiful Earth woman, Kayo. Bound by a forbidden past and a horrifying erotic encounter, she is destined to lure the Beast back to a helpless Earth. Her tortured soul cries out across dimensions, calling the Demon Beast to begin his reign of bloodlust, carnage, and terror! <br><br>
(Source: AniDB)

Earth is being invaded by a race of unclean beasts who wish to take over the planet. However, since Earth's environment is hostile to the demons they hatch a plan to impregnate as many human females as possible in order to create a race of human/demon hybrids which will rule the Earth by proxy. But the "Interplanetary Mutual Observation Agency" sends a duo of enforcers to Earth to hunt down and destroy the alien race they call the &lsquo;demon beasts&rsquo;.

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