I must say that I really enjoyed the ending of Tsukasa's arc, (and her arc as a whole, as well).
I thought that it flowed very well, and the last episode also made sure to include a healthy dosage of the rest of the gang, (Haruka's appearance, especially). I also really enjoyed Umehara's segment, (with hism overcoming his past and not living his life with regrets). Those words definitely helped Junichi with his relationship with Tsukasa, and it was just good advice in general.
I also thought that the sequence where Junichi expresses his love for Tsukasa, (for both sides of her personality), was also very heartfelt, and I thought that it was perfect for Tsukasa to really wail on Junichi. I was glad to see he fixed his mistake. :)
And the ending sequences was very pretty. I loved it when we saw them as a couple 10 years later, and their daughter got all upset cause she wanted to kiss her dad as well. That was too cute!
Anyways, I'm thinking that my ranking for the girls' arcs right now is this:
Haruka=Tsukasa>Ai>Sae>Kaoru>Rihoko
But oh how I wish Rihoko's was higher. :(