If you have only seen the movie and aren't sure if this manga series is just a retelling of the movie: the first chapter and half of the second is pretty much what takes place in the movie except with a few subtle changes and some really large ones, afterall the movie is *inspired* by the story of the manga with all the designs and characters being the same. Compared to how much of the manga is roughly shown in the movie I would say there is ~4 movies worth of content in this boxset.
For those who want to delve into a good manga I cannot recommend this enough, I'm not much of a manga man but I absolutely adore the world of Nausicaa purely for it's presentation and the astonishing skill behind it. This manga really immerses you into this war torn and cataclysmic world that's tragedy is only redeemed by the amazing visuals and of course the personalities of the characters and their development.
Attatched are some pictures of the box, poster, the glossy coloured pages at the start of each book and the books' covers.