This is a special to the main Kita e anime.
It contains some new footage and is accompanied by a few songs that play every few minutes.
Story wise there wasn't really anything to review about, as there simply wasn't one (at least that's how i saw that). You should rather go and watch the main series if you want to experience the exact story of this franchise.
The animations seemed okay, though as i could only watch a 360p youtube version that's all i can say about it. Maybe it would look better in 720p.
As for the sound, at least in my opinion, it was not that
Hence its score.
As for the characters, all we did see were mostly just random scenes of them, and not digging deeper in their characteristics.
I couldn't really enjoy this special -music (at least after mal) to be exact- that much and watched the rest of it while answering comments or forum posts.
In the end I come to the score of 3 (3.4 to be exact) out of 10 points/or how ever you want to call them.
I wouldn't really recommend it to anyone who didn't saw the main tv series or who isn't a fan of this franchise, unless you want to complete as many anime as possible, then it might be something for you, as it is fairly short with its only 28 minutes it has.