Saya and friends return to Okinawa for a brief time. They decide to do whatever they wish on this one-day break. Saya, Kai and Riku bury George's memento in his grave. And Saya meets her best friend Kaori at the Yaejima Park.

Mao gets frustrated for not being able to see Kai and she feels left out. Okamura, the Ryukyu Daily reporter, cannot forget about the sight he witnessed in the wine barrel storage at the lycee in Vietnam.

Mao wants to pursue Kai.

Okamura wants to find Saya to solve the mystery of what he saw. Then, two people with the same goal and different motives meet...

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...

Trying to rescue Riku, Saya jumps off the train and passes out in the blizzard. When she wakes up, Hagi is on her side, but everything around her is like in a dream. A dream of something that happened in the past, a long forgotten memory fallen into oblivion...

Kai is worried about Saya who fell out of the speeding train, but David insists on pressing on to find Dr. Ted A. Adams, a scientist involved in the Delta-67 research at the time of Vietnam War. Although they cannot find him, they find clues in his hous which lead them to an abandoned nuclear facility in Sverdlovsk-51...

Saya and the others check in at a hotel where they are supposed to meet up with others. While David is out doing some research, Riku comes down with a fever. Saya stays with her brother and takes care of him, but in this situation, Liza questions Saya about her true intention to fight the Chiroptera. Why does she kill them? Is she not getting others involved in the battles by killing Chiroptera? Saya, who is still confused about the real meaning of the dreams she had in Vietnam and in the Russian tundra, appears unable to find an answer. And then, Liza says something even more shocking...

David and the others arrive at the headquarters of the Red Shield, where they get checked for possible Chiropteran reactions, Kai finds out some shocking truth from "Joel's diary", a mysterious document in possession of the Red Shield. In the meantime, in France, the chevaliers, Amshel, Solomon, James and Nathan are meeting to decide the fate of Saya who has been keeping their plan from materializing.

Okamura and Mao arrive in France. They are looking for clues about the mystery behind the wine bottle of 1967 Chateau Duel that was transported out of the lycee in Vietnam. And their investigations lead them to an unexpected encounter. In the meantime, another party has reached French soil. They are known as the Schiff, and are determined to hunt Saya and Hagi.

Saya and Hagi arrived at the ruins of "The Zoo," were Saya's forgotten past is sleeping. The place is covered with overgrown grass and only a portion of the exterior walls is still standing. Soon, Saya's memories awake: her first encounter with Hagi, the incident on the Zoo owner's birthday, and the image of the whole building on fire...

Saya and Hagi meet Solomon in the Zoo again. Hagi fiercely attacks him. Solomon skillfully handles Hagi. Solomon tells them that he is a chevalier and that chevaliers are trying to kill Saya. He also adds that his feelings are different from the wishes of his brothers. Around that time, David, Kai and Riku arrive at the Zoo...

Finally Saya confronts Diva. The memory of the tragic event that took place at Joel's birthday starts to come back to Saya. And as she screams, Kai dash to the top of the tower...

Okamura and Mao arrive at the Zoo only to find a broken sword left behind. Saya and the others return to the Red Shield HQ with the wounded Riku. As Kai helplessly watches his still unconscious little brother, Saya wonders if what she did for Riku has really been the right choice...