This will appear to be a very disturbing animation to most. Designs by Murakami Teruaki, published by Soft by Demand (Anime), and based on the eroge by M no Violet. 
(Source: Bakunyuu) 
Note: There are 2 Nanase Ren OVAs produced totally different studios, but both feature the same character. The other one is the "Kranke Nanase Ren" (夜勤病棟　Kranke　七瀬恋) bit, which is a special for Yakin Byouto 
(Source: AniDB)

On a forbidden hospital ward, the head doctor performs madly erotic experiments, stripping the nursing staff of their uniforms, inhibitions and self-control... until even he is shocked by what he uncovers!

Before Ren Nanase was ever a night shift nurse, she was a sexy coed at a nursing school. Hearing rumors that one of the faculty is a rapist, she does exactly what any model citizen would do and confronts him about it. Unfortunately, things go downhill from there, and she winds up being his sex slave, getting a crash course in depravity. But in the middle of that perversion, could there be a hint of purity?
(Source: AniDB)

This anime focuses on Kazama Mana, the main character of Yakin Byoto 2. She is an intern works for a sanatorium as an intern nurse. Mana looks up to Nightingale, and she want to be an angel in white like her. But, Mizukawa Wataru, the patient whose days are numbered, says to her that there&rsquo;s no angel and begins to make her a sex game.
 
(Source: Anime News Network)

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