Following the traces of Diva, the leader of the Chiroptera, Saya and her group make their way to Russia. But awaiting their arrival is Diva's powerful protector Chiroptera, "The Chevalier." In the middle of the battle against this new threat, Saya is told a horrible truth-"It is because you are one of us." Is Saya a human, or something more sinister...? Featuring sixteen pages of illustrations by series character designer Chizu Hashii.