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Men who are hospitalized in a certain hospital are unreasonably and brutally assaulted night after night by a black gal nurse. When he was about to leave the hospital, he was attacked by a black gal nurse and fell back to his bed. If you are hospitalized here, no matter how many pebbles you pile up like "Sai-no-Kawara", you will be destroyed by a demon named Kuro Gal. This is the story of a man who can never leave the hospital.