Za Ginipiggu 4: Manhoru no Naka no Ningyo (1988)
Guinea Pig: Mermaid in a Manhole / ザ・ギニーピッグ マンホールの中の人魚
Raiting: 
5,4 /10
Genre: Horror
Director: Hideshi Hino
Stars: Shigeru Saiki, Mari Somei and Masami Hisamoto
Country: Japan
Release date: 25 July 1988
Length: 63 minutes
