This info was reproduced from Unearthed Films "Guinea Pig" sub-site in order to help dispel some of the confusion surrounding the series running order. Please note that not all the films were released with its number on the video box or on the print. Some films were also released out of sequence in some countries and the print, or sleeves, bear the title of the film as it was released in that country.
For example, "Android of Notre Dame", which was the fifth film in the series, bears the title "part 2" on the print used by Unearthed films for their DVD release, and to really confuse people they released it as a double bill with the actual first Guinea Pig film "Devil's Experiment". However, the actual second film was of course "Flowers of Flesh and Blood"
All told, there have been 6 films, 2 making-of specials and a compilation special. The true running order is as follows...
1) Devils' Experiment (1985)
2) Flowers of Flesh and Blood (1985)
3) He Never Dies (1986)
Making of Guinea Pig (1986)
4) Mermaid in a Manhole (1988)
5) Android of Notre Dame (1988)
6) Devil Doctor Woman (1990)
Making of Devil Doctor Woman (1990)
Guinea Pig's Greatest Cuts (1991) [AKA
The Devil's Experiment Flowers of Flesh and Blood He Never Dies
Mermaid in a Manhole Android of Notre Dame Devil Woman Doctor