Just watched the last episode...I liked it but didn't like it at the same time. To me, I thought it was a cop out that Yuuko came back. It cheapened the effect of her actually saying good by to Teiichi. I guess it was just hard for me to separate the reality from the fiction, which is what I think some viewers may have a hard time doing.
On the other hand, it was good to see them both together again. Definitely brings a warm feeling in your heart as their love for one another is pure and genuine. I'm sort of curious just how long will this last.
All in all, I enjoyed the series and glad I took a chance on watching this. I think I'll go ahead and read the manga and see how things will turn out from there.