If you watched the anime this is probably not going to make much sense to you. If you have not watched the anime it will make even LESS sense. This anime was really an attempt to bridge the gap between the anime plot and the manga plot. Which are HIGHLY different. The manga was done by the same author as Silent mobius and if you can find a copy this anime makes a LOT more sence and is highly enjoyable otherwise I would not bother.
The Movie was a good portrail of the Nadesico characters, However the story they were put in to lacked. If you watched the seres it was easy to fall in love with the Characters and the story dynamics. If you did not watch the series and you picked this up cold then you are wasting your time. It s older so no new flashy animation and the story is so disjointed, that without a foundation to base it on you wont know anything that is going on.