Here's a blog post about volume 5:
http://bosel.blog64.fc2.com/blog-entry-736.html (spoilers, obviously)
Hopefully, somebody can translate it.
Quote:
Originally Posted by Kagayaki
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Spoiler for Volume 5 (chapter 23++):
That's not Gilgamesh, but a new character who installed the Archer card (Gil ver.) from I can gather.
The 8th card was Gil, who turned into shota Gil after Illya removed the mud:
Needless to say, Miya and Illya were very shocked by that
Gil discusses with them and makes it clear he knows Miyu. Before he says anything more about her, Miyu attempts to kill him to silence him, but he defends against her attacks effortlessly (by using some kind of mirrors... first time I've seen that). He then reveals Miyu is from a parallel world. He explains a bunch of other stuff too, but I can't read it.
I don't have the raw where the two new girls show up so I don't know what happened to Gil. I hope he survived, he'd make a great addition to the cast.