Honestly, I'm REALLY looking forward to see what'll happen when she reaches -100%.
@gioseph: It's not spoilers, so I can answer. Because all 4 are different type of gyaru, there's no guarantee Kinjo will be selected. It's just as real a possibility that:
A) It could have an open-end where the reader will decide in their own terms (this usually pisses off readers for having no conclusion, but the point is to make your own conclusion that satisfies you)
B) It could have a multiple endings with each girl. It's not common but a few manga have been doing that lately.
It depends on the creativity of the mangaka.