I gave Bitter Virgin a score of 7/10. If you like mid 2000`s style of manga and a story that involves some topical problems and romance then i definitely recommend it.
I liked that the story/writer tackles some serious problems, that I think should be talked about, as they sadly occur more then they should in our world. Additionally, the character development was very good, If you have ever been in a serious relationship, then you are sure to identify with the story in some way.
Now to some of the bigger disadvantages of the story in my opinion: execution, pacing and realism. I think the execution of the story could have been better, at times some of the main twists or story points were made so "crazy" that the story became somewhat unrealistic, an example would be how religion was implemented. As for pacing, most of the story was fine however the end i felt was a bit rushed. It was as if all of the plot twists were thrown at the reader all at once.