With the new one (Nutmeg) by Otsu Hiyori out today, I'm rereading some of the older stuff... This one is one of the best! I really like the college age stories like this and "Maple Love", especially when they deal with one of the two who has to gradually come to realize how she feels. (Aqua Blue Cinema, though they are seniors in high school, is kind of the same, since one of them is already out in the working world really and the other is past the point of being a "school girl" and is preparing for entrance exams, and most of the story takes place over break when she is working as an assistant. Plus it is longer! Not quite the same, since I don't think she was ever clueless about her own feelings, just about the other girl's, and vice versa...)
Otsu Hiyori is one of the best around though!