stil-alive-n-slothing

Im looking for a manga (not yaoi) with a plot which goes like this:
Two girls visit a bar, one of them is popular and the other hides behind a plain facade. The plain one is a librarian. They've been friends since high school or uni. The popular girl (ill just call her Biotch) sees to it that the plain one (ill call her Prim) tags along with her wherever, so that guys would notice only Biotch, basically to boost her own image/ ego. Anyway at the bar, the guy (who I think is the bartender/ owner) ("Prey") is the new target of Biotch, but to her consternation Prey notices Prim. Biotch gives Prim hell about it. When Prim visits the bar alone againto meet Prey coz she's fascinated by him too; Prey tells her something along the lines of why the hell is she hiding her trueself. The next time the Biotch puts her down ( i think that's after Prey rejected her, Prim resolves to unveil her trueself (not so Prim anymore) after cutting ties with the Biotch and is so different that while bumping on the street, she leaves the Biotch stunned and speechless. Anyway at the end of it all, Prey ends up being Prim's Prey.
Sorry for the lengthy summary. I can't recollect the name and whether it was a part of a series. Kind of want to read it again.
Any clues to the mystery much appreciated(￣∇￣")

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