Rain, though it seems to be a little known manga, is actually quite a good quick read. Although I expected the typical kingdom-war kind of story, and it did follow that stereotype quite a bit, it was hilarious at some parts. The first few chapters have a bare thread plotline linking several characters in different places, but gets better as the story moves forward.
Artwise, the character designs are rather simple, but come together nicely; I personally liked it, but different people have different tastes
Character development was a bit limited, with the main character (Rain) being rather interesting/mysterious, but the rest don't get much time to develop
I have to say, I actually enjoyed the manga more than I first expected, just because of the moments that make you snicker and laugh out loud...overall, if there were more chapters released (only 6 as of now) I believe this would turn out into a great manga