The All Night Long trilogy reaches its apotheosis with the third instalment: it is both the best realised and the most relentless of the lot.

Like its two predecessors, All Night Long 3 revolves around the descent of a nerdy teenager into a disturbed killer. His work environment certainly doesn't help matters. As a cleaner in a love hotel (where couples can rent rooms by the hour), he is surrounded by an equally warped group of colleagues who share a penchant for voyeurism and collecting pubic hairs.

From cleaning up dirty tissues and used condoms, young Kikuo develops a fascination for garbage, specifically the household garbage of women. On one of his nightly scavenger hunts, he encounters Kawasaki, who calls himself a 'dust hunter' and who takes the debutant under his wing. After meeting Kawasaki and seeing the rows of personal files he has meticulously put together from women's personal objects found in the trash (incorporating everything from addresses to menstrual cycles), Kikuo's own methods become more intensive and methodical. When three of his colleagues assault and abuse a girl they found stealing at the hotel, Kikuo takes her back home with him, chains her to the bed and starts to experimentally torture the girl to extract as much data as possible for his files.