Sachi: the classmate dressed as a maid who will grant any wish. However, to achieve that end she will employ any means necessary. Everyone at the academy knows Sachi has that dangerous side to her, and are careful not to be humble when they speak to her. One day with summer close at hand, Michiru carelessly tells Sachi to make the tests go away while preparing for finals.

The survivors of the crash continue to make do as Kazuki continues to care for the wounded. As the days pass, they bury their dead and continue to gather what little food they can find. Their teacher, having scouted around, takes half of the food and leaves, promising that he will return with help. Despair sets in when he does not return after a couple of days. Malnourished, some of the girls start acting strangely. Finally, the pet dog of one of the girls perishes and is butchered to provide the survivors with sustenance.

Yuuji goes to America to follow the same path as Asako, and through his rigorous military life meets and forms a deep bond with war buddies who go through the same joys and sorrows.

A formless supporter, "Thanatos," suddenly supports Amane and the others. "Her" objective is also to liberate and rescue Yuuji Kazami. Thanatos and the Mihama girls' interests align and begin preparing to execute their mission. The girls are perplexed by Thanatos's seemingly cryptic instructions that unfold via cell phone, but they bring the girls better results than they ever expected in bringing their goal to fruition.

The Mihama girls have executed their intense getaway and have rescued Yuuji. Waiting at their goal is Kazuki Kazami, who lived as the core of Thanatos for a long time. This unexpected encounter leaves Yuuji and Amane unable to hide their surprise, but circumstances don't allow them time to savor their emotional reunion.

Tartarus, a gigantic, man-made island, floats on the Pacific Ocean. It is both the adversary of society, and the castle of Heath Oslo, Yuuji Kazami's mortal enemy. Oslo quietly awaits the moment Yuuji Kazami, the final key he needs to fulfill his ambitions, appears before him once more.