The best part of this episode was definitely the first half. YURIVISION is still a plot device, but it's one that's being used really well. But both the plot and drama are working fairly well, and a lot of credit for making both those elements have impact has to go to the really good use of music.
The second half, I didn't enjoy as much. I thought the explanation for the alien presence was totally stupid. Yes, I realize this entire show is built on plot devices, but that particular one was by far the silliest. I didn't really appreciate Ayuki's flower metaphor either... it may have been a clever metaphor, but it's a clever metaphor for a
cliche.
The confrontation at the end was an interesting scene, but it lacked the dramatic weight and tension of the controntation at the beginning of the episode.
This is, in my opinion, by far the strongest feature of Kashimashi's story to date: it's been anything but predictable.
On a slightly different note, the art is still great, but the animation seems to have gone downhill. A bit of discreet corner cutting, I suspect.