User blog comment:SpookyBoogie27/Light Novel Spoilers/@comment-1359322-20131002114226

Roughly about 3 more weeks till Volume 16 is released. Here’s a new synopsis.
 * Hetare Vampire Gasper Vladi(Cross dressing boy) will show his manly side!
 * A coup d’état occurred in the Kingdom of Vampires and now I can’t get in contact with Rias!? We, the Occult Research Club, goes directly to Romania. In that land, Valerie who had been charmed by the Holy-Grail was waiting for us. Gasper who stood there astonished due to the change in his saviour.
 * “I……I want to save Valerie!”
 * A single person stood in front of us, the one who stood up to respond to Gasper’s desperate plead. His name is Rizevim—. Rizevim Livan Lucifer. And he is our true enemy.
 * The devilsh school love comedy battle fantasy. This time its more serious than usual!? –It can’t be.

(Taken from Code-Zero's blog)