Guinea Pig: Mermaid in the Manhole

Original title: ザ・ギニーピッグ マンホールの中の人魚

Directed by Hideshi Hino

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.