A young man and woman - both strangers - go into a dentist's office together. He passes out due to the anesthesia and has a series of bizarre and perverse dreams involving the chick being pursued and sexually brutalized by the dentist, who happens to be a vampire.
The sleaze-factor is pretty steadfast here and occasionally entertaining. When this chick gets naked, she STAYS naked - getting hog-tied and beaten, going through a soapy car wash, sneaking out of a hotel lobby and trying to run up the "down" side of a department store escalator to escape the rapey Japanese equivalent to Dracula. All nekkid! Good shit. There's also quite a few 'hardcore' scenes thrown into the mix, which was nice change-of-pace considering Japan is and was (especially back in "the day") very strict on uncensored sex. However, most of these segments weren't very arousing...
"Day Dream" isn't anything spectacular - just sort of a sleazy hodgepodge of artful porn and pinku influence with a erotic vampire annexation for good measure. At the very least, it's an interesting 'arthouse' flick with some decent production value and plenty of weirdness. Worth a look for fans of Jap-smut.