School. Biology Room. Night. Kai, who has come to pick up Saya, witnesses an incredible scene: her sister covered with blood is fighting with a sword against a creature beyond any description. Then Saya faints on the spot... The next day, the incident is treated as a murder committed by a drug addicted American soldier, and there seems to be no trace of the creature. Taken to the hospital from school, Saya accidentally hears the conversation between George and David, a mysterious man who watches over Saya. And what she hears makes her run away terrified...

An annual ball is being held in the lycee. Students, guardians and guests in formal attire are gathered in the school cafeteria when Saya arrives in a dress she borrowed from Min. On the dance floor, Saya meets a young man named Solomon, who asks her for a dance. As the music starts, David reaches the entrance to the basement surrounded by blue roses...

Saya and the others arrive in Vladivostok, and take the Trans-Siberian Railroad with Elizaveta, a Russian Red Shield agent. But the Chiroptera are lurking in the most unexpected places...