Seijun Kango Gakuin: Shinjin Nurse "Yumi" Chigyaku no Kango Jisshuu
Ano: 2002
Based on the erotic game by Anim. You wouldn't think that a hospital would be the setting for a series of erotic adventures, but when a new crop of nurses' aides reports for duty, they're confronted by an erotic lesson plan that pushes them to the brink of ecstacy... and sanity.