Based on the CG collection by Sakusei Kenkyuujo (搾精研究所).

Our main character, Yamada, has to ejaculate once every 3 hours due to a strange disease. He was hospitalized with two broken hands, and the hospital is located in a spot where evil spirits of the mountains and rivers have gathered and possessed the nurses! Will Yamada make it out of the hospital alive? The infamous work from the Heisei era that shocked the Internet, the "Sperm Ward," has somehow been completely remade for Yanmaga! Look how we push the limits of an all-ages magazine!

(Source: Yanmaga, translated)