User blog comment:Cookievalenzuela666/which girl is going to get their own volume next?/@comment-24502975-20140709160247

There's a very high chance Kuroka's a virgin, she just doesn't let anyone realize it.

Well, v19 is Xenovia, v20 could be either Vali Team (which involves Kuroka) or Raiser, but I'd say Kuroka's the next girl to have her own volume (after Xenovia of course).