Well, i'm a fan and suspicious to talk about this anime, but i'll try to not be tendentious. This special episode is very good, with light mistery, fast action scenes, and mainly that calm and serene atmosphere of Kino no Tabi. The dialogues are good too.
But i missed something about the end. The final question, that leaves the spectator wondering about similar meanings and things in our lifes, was not strong as usual. Also, the energy and excitement wasn't the same as we can see in the others episodes.
Overall, a good story, worth watching.