Wicked City (1987)

In Tokyo, Taki has just successfully seduced a woman and gone back to her place.  While they are lying naked in bed, she suddenly transforms into a spider-like creature.  Taki narrowly avoids being castrated.  The woman-spider laughs and climbs down the high-rise and vanishes into the woods.  Though most people are unaware, supernatural beings have always lived among humanity.  They are from the Black World.  There has been a truce between the sides, but this encounter indicates the peace is about to collapse.  Taki is a Black Guard, a special agent who fights the supernatural.

Called into a meeting, he is tasked with protecting a VIP: Giuseppe Mayart.  Mayart is key to extending the peace for another 500 years.  Since it is so important, Taki is given a partner: Makie.  Makie is supernatural from the Black World, but she hopes for peace.  In fact, she says much of the Black World would have peace but many view humans as lesser beings to be subjugated or slain.  Taki and Makie meeting each other while fighting some of those who want to prevent the peace treaty.  Makie proves to be an alarmingly beautiful woman despite wearing a man's suit and tie.  After pleasantries, they pickup Giuseppe and escort him to a psychically protected hotel, a safe house for the Black Guard.  Giuseppe is less than thrilled as he is hornier than a sailor after 6 months at sea.  Though the treaty is to be signed tomorrow, this proves to be the longest night of Taki and Makie's lives.

Despite being an anime, there is plentiful nudity and sexual situations.  It is not an easy watch with all the sex, which frequently sees Makie getting groped, molested, or worse.  Yeah, this is not an anime for the kids.

The story has a big twist at the end that upends much of what had gone before.  If this was what had been intended, then that earlier bit when this happened makes no sense at all.  The twist undermines the movie.  Ugh.  As for the fights, they are mediocre.  Each supernatural has its generally disgusting attack mode, be it claws from a ribcage, tentacles from the chest, a toothy maw between the woman-spider's legs (really!), or a sexual-orifice that dominates a demonic woman's abdomen and chest.

Skip this one.