Well well, what a special series we have here. It is nothing close to what I have expected and I watched this and ef: tale of memories right after Kanon. If you expect to find a main storyline to follow well good luck with that. Ef has various overlapping arcs that are loosely connected with each other. Instead of focusing on character developments the anime tries to bring out some ideas from those relationships. It is hard to keep track of the past and present with all those artistic cutscenes, which I found them extremely annoying at first. However, if you realize that the storyline is not what you should be mainly focused on your viewpoint of this anime will change and you will definitely grow to like it.
Note: Try to enjoy and focus on the ideas the Anime is trying to convey rather than trying to focus on the story itself. It is hard to tell if there is any main characters at all although Ef: Tale of Melodies focuses more on Yuu Himura and Yuuko Amamiya