Rem can't sleep - ever - but she can enter the world of dreams just the same, so she decides to use her unusual powers ti make a living as a private investigator in the dreamworld. Lieutenant Sakaki doesn't think it's a good idea... This is the original, 1-part hentai version of the OVA, later remade into a less-explicit version with 2 additional episodes.
Dream Hunter Rem is an anime OVA series released from 1985 to 1992. Rem Ayanokōji is a "dream hunter," a person capable of entering the dreams of sleeping people and fighting the demons causing nightmares. The stories have their base in supernatural and standard horror, with action scenes and mystery thrown in. The first episode was originally released as a hentai OVA which contained a few pornographic scenes. Due to high popularity, the production team decided to release subsequent videos in the non-hentai anime market. The first video was later re-released as "Special Version", removing all pornographic scenes and adding a new episode.