The best part of this doujin is its cover. The author was sparing in using illustrations to show what was going on, so for those who can't read the japanese text, the story will seem more random than in other Gurren Lagann doujins. For example, there is no visual explanation for the markings on Yoko's arms and torso on the cover. One might suppose that being patterns, they are ID tattoos for a reader, but some doujins by other authors have drugging devices that stamp similar patterns onto the sex slaves.
The tag Aurelia for the circle's name might be wrong. First, the circle spells its name as "Auleria" in the doujin. The Doujinshi Database also has this circle's romaji name as "Auleria" and has grouped all the doujinshi made by this group under that name. You can see more at: