This stylized porn thriller has a mysterious, foreboding tone, which is helped by its eerie incidental music.

Anri Mizuna is a Japanese hospital nurse who seems haunted, tortured and constantly ill at ease - but by what? She has bizarre sex dreams and wakes up in a cold sweat. The doctor she assists wears dark sunglasses. That is, until one day, he removes the glasses, revealing his demonic, yet seductive eyes. He also sports Dracula fangs. She's left powerless to be groped roughly. When the doc goes down on the pussy, Mizuni grimaces desperately, as though she were in severe pain. He gives her a fast and hard fingering, and she soaks his hand. Exhausted, she delivers a slow b.j., reluctantly at first. A few intense moments of fucking on the examination table lead to an intense finish in a mish, with the doc cumming on her face. Mizuna then reveals that she, too, now has vampire teeth!

Later, Mizuna preys upon an unconscious patient and, like a succubus, performs oral on him before spitting his semen into a test tube. Later, the patient rises and, like a zombie somnambulist, stumbles through the hospital halls to the basement, where he finds a lusty Mizuna, who's now decked out in a sexy, vampy black and red skimpy vinyl outfit. Mizuna is now much more devilish and aggressive than before, rubbing his crotch and licking his nipple. She manages some very alluring glances during the b.j. Later, he attacks her like a man possessed, groping her tits and licking her shapely, round ass from behind. She sits on his face, his nose buried in her thick pubic hair. The ensuing tryst is lively and includes action in the doggie, reverse cowgirl and mish positions. After it's over, he reveals his sharp fangs.

Is there an actual plot to all this? Darned if this reviewer can surmise it.