Hiwatari Saki, Boku no Chikyuu o Mamotte (5 vol. of 21)

Seven modern Tokyo youths are the reincarnations of seven alien scientists who lived on the moon long ago, and experience dreams of their past lives.  Arisu is one of these teenagers.  To explain the various subplots and elements would be too hard to describe without taking up several pages—and of course, there's intrigue and many mysteries that haven't been revealed just yet.  This is another complex work, in the same category as X or Angel Sanctuary, and it's one that's rewarding to try to figure out (but there are times when I'm not sure whether the ambiguity is intentional or just a result of my miscomprension.)  There is a lot going on in this manga, and so far I feel like not enough time is spent on all of these subplots.  But that's the point, I suppose.  That there's so many unresolved ends is perfectly appropriate for a manga so long that's only a quarter over at the point I've reached.  Hiwatari takes a long time to develop things, and I suppose that might try people's patience.  Still, there's a lot to admire in this work.  I think that the most, and the least, I could say about it is that there is much glittering 'potential' there—and I'm very eager to find out whether the ending makes full use of that potential.