Guinea Pig: Mermaid in the Manhole (1988)

Cast

Shigeru Saiki, Mari Somei, Go Riju, Masami Hisamoto, Tsuyoshi Toshishige

Overview

An artist dealing with the grief of his wife leaving him finds solace in painting the squalor of the sewer. He discovers a trapped mermaid, whom he brings home to heal. Her condition worsens, and she asks the artist to paint her before she dies.