Story about Guinea Pig 4: Mermaid in a Manhole / ザ・ギニーピッグ マンホールの中の人魚 / 下水道的美人鱼
An artist finds and rescues a mermaid in a sewer. He takes her home with him and she develops sores ...
An artist finds and rescues a mermaid in a sewer. He takes her home with him and she develops sores all over her body that begin to pustulate and bleed. He uses what oozes from her sores to paint her portrait. When he can no longer handle it anymore he breaks down and dismembers her body.