This is the 4th installment in the notorious "Guinea Pig" series and if you have seen any of them you know by now what you are getting yourself into.
Unlike "Guinea Pig 1 & 2" this movie is actually a story about an artist who has just recently lost his wife. One day he decides to go into a sewer that he used to go in when he was a child. While down there he discovers a beautiful mermaid whom he saw many years before when a child. When he discovers that the mermaid is ill he decides to take her back and take care of her. This becomes more work then he bargained for. The mermaid starts getting puss pockets all over her body which ooze multiple colors. She then asks him to make a painting of her as she is dying, which he does without question. As the movie goes on, she gets more and more diseased and the artist doesn't know what to do.
Well... this was quite an interesting film. Not exactly what I was expecting from the series. Not to say that it was not a good movie, because I thought it was rather good. I don't know what fans of the series would think of this film but it definitely has its ultra gore moments. One scene in particular with the mermaid vomiting worms. Very gross. 8/10