lily_white said: Did Karaagetarou reupload the book in a different format?
I don't think Karaagetarou was behind the first upload. The change in the title in the lower left corner of this page, the larger margins, and the jammed-together double pages suggest to me that this is a touch-up of the original doujin done for a second print run (or maybe just for Pixiv) and posted directly from the digital source.