Yuuji moves forward on his path as a soldier to protect "an important woman": Asako. However, she leaves his side without waiting until he's reached maturity. Yuuji is yet again tormented by a sense of helplessness, but is saved by Asako's parting words and begins to be able to walk on his own two feet once more.

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 international terrorist Heath Oslo uses nuclear weapons as a shield to threaten the nation. The nation plans to make Yuuji a human sacrifice in their dealings with Oslo. There is no other way to save Yuuji from this crisis but to rescue him as he is transferred from Ichigaya to Akasaka.