For a manga, this seems to be a rather short series, done in three volumes. Something I would like to bring up is that the lettering at times seems to have been poorly done, making it hard to read, though that might have simply have been the limitations of the panel layout. The story pulls together the separate storylines into an ending that seems to wrap up most of the major plot points, and at the same time doesn't really answer a lot of questions but handles them in such a way that you don't really think about it until you try to break it down. The secret of Neo is revealed -- and it's something more complicated and more reasonable than just a prehistoric creature -- and how this ties into Misaki's own background. The series ends with a mild recommendation. I wanted to give it a stronger recommendation due to the story and the characters, but the lack of background is holding it back.
Chikyu Misaki vol. 2 and vol. 3 are both available from Right Stuf, Intl., an online retailer specializing in anime and manga.