User blog comment:Jopjopjop/Volume 18 Spoilers/@comment-24053170-20140624001114

So volume 18 is irinas story, and volume 19 will be about xenovia, so I am guessing that volume 20 will either have to be about Ophis or Ravel, since there really the only members of the harem who haven't gotten there own volume yet. what do you guys think?