In line with the eroge by M no Violet.

Before Ren Nanase was ever an evening shift nurse, she was a sexy coed in a nursing school. Hearing rumors that one of several faculty is really a rapist, she does exactly what any model citizen would do and confronts him about this. Unfortunately, things go downhill from there, and she winds up being his sex slave, obtaining a quick studies in depravity. But in the center of that perversion, will be there a touch of purity?