My first guess is that the artist of this picture is aogiri_penta, considering that he made post #985007 which is both in the same style and from the same series. I haven't found anything on his/her blog, so I'm tagging it with artist_request for now. See also post #1315568.

He's the credited artist for this game, so yeah, it's him. There are actually advertisements for it at the top of his blog.

EB said:
He's the credited artist for this game, so yeah, it's him. There are actually advertisements for it at the top of his blog.

Thank ye kindly! I did noticed the ads on his page, but I thought that they were, well, just ads. Guess I was wrong.