Yakin Byoutou San
English title: Night Shift Nurses: Experiment
Japanese title: 夜勤病棟・参
Alternative titles: Night Shift Nurses 3, Yakin Byoutou 3, NSN 3, Yakin Byoutou Kranke Kodama Ai, Night Shift Nurses Experiment
Type: OVA
Source: Visual novel
Episodes: 3
Status: Finished Airing
Aired: Jul 29, 2005 to Jan 27, 2006
Duration: 28 min per ep
Rating: Rx - Hentai
Studios: AT-2
Producers: Discovery
Licensors: Adult Source Media
Genres: Hentai

Sora was lying in front of a hospital. He was seriously injured, and when he was about to die, a nurse, Yamami Yu, helped him. 
He was sent into an emergency ward, and he met a beautiful woman, Mikage Reika. She was a director of the hospital, and she asked him to become a test subject. Because he didn't have any relatives, he accepted it. Then, Yagami Yu was supposed to take care of him. 
Since that day, his fate had changed a lot.

(Source: AnimeNfo)