Chuushaki

A young girl named Mana is determine to become a good nurse. She plans to attend the Hirasawa Nurse School, which was also the place where her late mother studied. However, upon arrival Mana finds out that strange things are happening in the school. Not only some of the teachers are acting weird, but the fellow aspiring nurses seem to be more interested in sex than in actually learning their profession...

[From Moby Games]