ShogunAssassin

In my honest opinion, this is a fantastic manga for Shounen readers!  For many people, it might make you think of it as a mix between LOST and Jurassic Park, which isn't a bad thing.  It has a great feeling of survival and mystery to it and you cna tell the romance progresses steadily.  There is also a few comic relief characters in it that make the mood just right... for guys that is.