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.

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...

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...

As Irene starts showing signs of dying, Kai refers to Saya what he was told about Schiff. But for the girl, who firmly believes that her task is to exterminate the Chiroptera, this is the first time she feels desperately far away from her stepbrother. In the meanwhile, Julia isolates a DNA component that apparently does not belong to any known living creature on this planet...

Kai begs Saya to give her blood to Irene and save her from the advancing crystallization process. But Saya hesitates: what will she decide in the end?

In the meanwhile, in the Red Shield HQ, Julia continues her researches, but she notices that her mentor Collins has got in touch with an unexpected person...

It's a beautiful day, and Saya invites Hagi, Riku and Kai for a walk in the streets of Paris. It had been a long time since they enjoyed a peaceful time. But Kai is not comfortable and distances from Saya. Riku tries to go between the two, so that the three could restore their former relationship.

Meanwhile, David receives an unexpected visitor...

It has been one year since Diva's attack on the Red Shield Headquarters. Kai and the others stay with David's old comrade in the outskirts of London. Passing time brings various changes to everyone. But again, the Chiroptera overshadow the streets of London...

Kai at last is reunited with Saya, but the girl faints from exhaustion. Kai brings Saya to Glay's home to take care of her, but the enemy is again lurking in the darkness ready to attack...

After the battle on Christina Island, Saya and Kai returns once to Glay's residence in London. Javier and Nahabi insistently ask them to go fishing together. In the peaceful countryside, Saya enjoys some time out to relax. Meanwhile, David and Joel attend a party. Their aim is to meet the host of the party, Amshel...

Okamura and Mao's apartment in New York is blown up and they have to move to David's place. In the meantime, Joel is investigating the US military and Chevalier's scheme, and he obtains information relating to Diva...

Kai sneaks into Diva's show at the air force base. He is introduced to Diva by Amshel and offered to join as Diva's Chevalier. As Kai refuses, Diva bares her fangs. Just in time, Saya and Hagi arrive, but Amshel and Nathan's raid hinders them to advance. At the same time, David spots Julia in the base and follows her.