Guinea Pig: Mermaid in the Manhole An artist rescues a mermaid in a sewer who develops bleeding sores all over her body, paints a portrait with her oozes and eventually disjoints her. Details Casts Posters Title Guinea Pig: Mermaid in the Manhole Release Date 1988-07-25 Runtime 01 Hours 03 Minutes Genres Horror Romance Production Companies Japan Home Video Production Countries Japan Shigeru Saiki... The Artist... Mari Somei... The Mermaid... Go Riju... Male Neighbor... Masami Hisamoto... Female Neighbor... Tsuyoshi Toshishige... ... Original Size (550x800) Original Size (1400x2100)