The official doujin has 44 pages while this upload has 38 pages. It's a shame that the usual doujinshi author's index, colophon, commentary, and end credits pages are not included in this upload. Nor did the uploader bother to identify if that is all, or if some of the material was deliberately not uploaded. That is often possible as there are a substantial number of hentai doujin/manga consumers that actually do not like nor keep credits pages. The missing pages would have helped in trying to decode the spelling of the circle's name and some other details. Some additional info on the doujin is available at:

http://doujinshi.mugimugi.org/book/352734/

Base +17, Maximum_Joe +30