They divided the whole series into several arcs... 6 to be exact, each focuses on the story of a girl which will pair together with Junichi. Each arc is about 4 episodes length at least, and though the arc starts at the time when Junichi got dumped on the Xmas nite, but the ending differs depending on the girl he got paired with. So yea... basically its the same "rinse and repeat" style of story.
Don't worry, each arc has its own story. It doesn't have to be like Haruka arc's story (or maybe it will... but for Kaoru's arc... it doesn't matter at all
).
Also to add extra comment about the ED, i just love the piano tune at the opening of the theme. When i hear the tune, my mind suddenly flashed back to ARIA series (the series that had captured me with its great BGM and piano tunes). Its at that moment where i understood that its a song that i'm definitely gonna love for sure.