Okay, hints?
For the first one, I gave a strong hint to where to find the author and eventually the Manga. Okay, it's Shintaro Kago(was that hard? Plus, I have mentioned him
here).
For the second, the mangaka was a co-artist to the mangaka of the mangas I love(Nihei, obviously). The Genre is Sci-fi(Usually dubbed as Cyberpunk) and Fantasy(because there are demons and black powder magic). I even mentioned a part of it, but won't tell what exactly, because that's pretty much giving it out.
Guess the two, and you get two points and pic posting. Really, nothing hard, I swear by Ashtar Command.
Here is another page:
^-Almost 2/3 of the characters of the Manga are in that page.