On a ship leaving Okinawa, Riku hears about the tragic event that took place, and so he confines himself in his cabin. Kai tries to comfort Riku, but he doesn't even respond. Saya feels that she is solely responsible for her family's misfortune. Seeing Saya, Hagi takes out the sword and tells her that the key to take back her past lies at the end of the continuous battle. Meanwhile, Okamura, a reporter for the Ryukyu Daily who was investigating the random killing and came to focus on Yanbaru, finds an empty case of Bordeaux wine in the dump yard of an industrial waste disposal company...

Saya infiltrates a girls' boarding school, the Lycee des Cinq Fleches. Hagi too sneaks in, disguised a gardener. Saya learns from her roommate Ming about a legend of a phantom who fell in love with the prettiest girl from the school and who presented her with a blue rose flower.

In the morning, as Saya comes into her classroom, she finds a blue rose.

Students are murmuring about the phantom legend that has been the gossip at the lycee. Saya and Hagi sneak into a rose garden beside the church where it is said the blue roses were in bloom. And they find steps leading to the underground...

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 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...

At the experiment farm of Les Cinq Fleches Pharmaceutical, Saya is surrounded by child Chiroptera. But confronted with a mysterious humming coming from nowhere, the howling of the Chiroptera and a choking smell of blood, the girl goes berserk, and swings the sword at anything that comes into her view without even distinguishing between friend and enemy...

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...

Kai tells Saya that he knows what she is. He suggests that Saya read Joels Diary. As she meets Joel at Red Shield HQ and starts reading the Diary, the shocking truth about Diva and the events in Vietnam back in 1972 slowly unveils...

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...

Diva and Carl's attack puts the Red Shield Headquarters into great chaos. The ship's wall and floor are shattered and the black clad bodies lay everywhere. Saya faces difficulty as Carl continues to launch destructive attacks. Kai takes Riku to join David at a meeting point inside the ship, but...

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...

Assisted by Okamura and Mao, David locates the Goldsmith and Cinq Fleches joint-venture lab in the outskirts of London. Meanwhile, Saya and Hagi discover that Diva is going to perform at the Royal Opera House in London. They sneak into the opera house, but...

Saya is invited to a birthday party for Javier, one of Glay's children. But once at the party, Saya feels that she does not belong there after all. As Kai and all others care for Saya, who has shut her mind from them, Carl closes in on Glay's residence with Corpse Corps. And his distorted love for Saya forces him to yet further insanity...