First, I should note that, despite how it begins, this VN turned out to not be a nukige.  However, it is definitely not a 'pure love' story from beginning to end.  A literal translation of the Japanese name would be 'The warped lie and love letter' with 'letter' being interchangeable with the word for a stereotyped reputation.

Second, I should warn anyone who plays this to either do Saeko's path last or read only her path.  It is just too hard to pick another heroine after picking Saeko.  I did it, but I can honestly say that I felt like I was abandoning Saeko the whole time.

This game's setting is like this:  The protagonist as a child was a little... mature for his age.  He and his girlfriend at the time (Saeko) even went so far as to have sex (without really understanding how society would see their actions), and eventually a rumor went around that he had raped her, even as she moved away.  This left him bitter and feeling betrayed, the rumors destroying his family life and isolating him.  The young man at the beginning of this story has basically accepted his false reptutation and chosen to act it out, forming relationships with multiple young women (who are the heroines of this story).  Then, Saeko returns, stating a desire for him to 'dirty' her again.

A lot of this game is about the protagonist slowly overcoming his past and forming a more honest relationship with the girls despite the rather warped way it begins (thus the name of the game).  Saeko's path can be considered the 'main' path, because it deals most directly with the protagonist's past.  However, regardless of the path, the protagonist manages to get past his trauma and rise above it, if you pick the good ending, lol.

Anyway, this game surprised me with its quality of storytelling.  I honestly enjoyed the interplay, and the protagonist's change of heart is portrayed with surprising subtlety for a Japanese writer (most Japanese VN writers tend to like the 'sudden overwhelming flood of emotion' way of doing things).  While there is plenty of h content in the game, it is not overwhelming, though it is definitely more than the average charage. 

Overall, this game is not suited to someone looking for straightforward relationships and love with relatively pure beginnings.  The characters in this VN are all scarred or damaged in some way, which becomes obvious as you play.  Nonetheless, I found it an immensely enjoyable experience.

Edit: Oh, and if you dislike sado-masochistic relationships, you should probably avoid this VN.  While it doesn't go to the real extremes like mutilation or electric shock, it does touch on more 'normal' SM activities.