This is seriously my favorite drama. No matter how many I watch, I can't think of any of them as better then Tatta Hitotsu no Koi. I absolutely love it.

The whole story is beautiful. It's innocent, refreshing, a little bit exaggerated at times, but still wonderful. There's a rather unexplainable Titanic sort of feel to the entire drama, except, it doesn't end sad (in my opinion that feel comes from the music, which is amazing, by the way. I even put it on my iPod I love it so much.)

This may be a little spoiler-ish, not a lot, but just a little (talking about the personality of one of the main characters):
To some Nao may seem like a very selfish girl, who only thinks about herself, and I can understand that, but really when you think about it and really consider her life and imagine yourself in her position, can you blame her? Can you really say she should know better? And besides, doesn't she seem to grow up at the end?
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Point is, I LOVE Tatta Hitotsu no Koi, and I highly recommended it. I've watched it too many times to count, and I plan to watch it again.