Edit: Replaced with proper rip, previous one used wrong profile when converting ppm to jpg (apologize for this, but the batch rip is done long time ago), this should be more closer to raw now. The difference can hardly be seen by bare eyes, you only need to re-download this gallery if you are super hardcore on quality.
#137 of 2D Dream Comics, the title possibly parodies DC comics's title of the same name and the movie from that year :D but actually nothing relates of course.
bought it myself and directly ripped from: http://www.dlsite.com/books/work/=/product_id/BJ001394.html If you have DRM free PDFs and not sure how to rip them, you can send them to me and I'll try to help.
info on mugi: http://doujinshi.mugimugi.org/book/232757/Dooms-Days/ physical version: http://www.amazon.co.jp/gp/product/4860325664