Saya and the others follow a container cargo carrying Diva who was transported out of the lycee. The operational unit of the Red Shield, Clara, Spencer, Rogers and McCoy, joins the pursuit. They go upstream on the Mekong River and head toward the experiment farm of Les Cinq Fleches Pharmaceutical. The farm had collected children from all over Vietnam. Mui, Riku and Kai were among them. But Saya and her friends are not aware of this fact as they get ready for the showdown...

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...

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...

A year had passed and that period of time had clearly brought changes to the Schiff. Thorns emerge in Goodliff and Dirth. The few remaining comrades draw together quietly in an abandoned church avoiding the sun.

But they are about to be battered by another desperation, as the Corpse Corps abruptly attacks them...

Saya learns that Diva is pregnant with twins. She decides to kill Diva before the twins who would only strengthen the enemy are born. Meanwhile, there remained three surviving Schiff. Moses and Lulu are staggered when they catch a sign of death, "Thorn," on Karman's neck.