With the chaos of the Third Kanto Battle subsiding, peace is finally returning to the Tendo Civil Security Agency, and Rentaro, Kisara, Enju, and Tina are taking full advantage of the quiet. But when an old friend from Rentaro's childhood reappears, their bright days turn suddenly dark--and Rentaro finds himself imprisoned for a senseless murder. He plans a desperate escape, but his enemies keep coming, and they are like nothing he's ever fought before...

Rentaro, Enju, Kisara, and the fearsome sniper Tina--just when they thought the future was looking slightly less uncertain, they're confronted with a terrible discovery: One of the giant monoliths that protects Tokyo Area from invasion by the monstrous Gastrea is on the verge of collapse, putting the lives of every single human within the city at risk! Is there any way to save Tokyo Area? And even if there is, what will become of Rentaro, Enju, Kisara, and Tina?

One of the giant Monoliths that protects Tokyo Area from the virally superpowered Gastrea creatures has been destroyed. And right on schedule, the Stage Four Gastrea Aldebaran leads an invading army of the monsters into the city. The elite self-defense forces are sent to face them, and the terrible sounds of war echo across a newly christened battlefield--but soon a tense silence falls. What is it that appears before the eyes of Rentaro and his friends? The near-future thriller of post-apocalyptic survival continues!

Rentaro is still a fugitive, running from the law for a murder he didn't commit. He and Hotaru are bruised, bleeding, and barely on speaking terms, but they're equally desperate to uncover the identity of Suibara's killer. However, Police Superintendent Hitsuma hasn't given up on pursuing Rentaro! With Hitsuma's impending marriage to heartbroken Kisara advancing closer and closer, will Rentaro clear his name and rescue her in time? And what does saving Kisara mean for their future?

The near future. A terrible battle against a parasitic virus called "Gastrea" has been fought...and lost. Humanity is cornered and lives in despair. Rentaro and Enju face constant danger in their work as a team of specialists working for the Tendo Civil Security Agency, one of several groups dedicated to fighting Gastrea. Enju is one of the "cursed children," who survived the virus and gained superhuman powers as a result. A crazed top-hat-wearing terrorist is on the loose, but Rentaro's got his hands full just dealing with his fellow civsec agents!

The Akasaka Palace reception hall is playing host to a summit welcoming the leaders of Japan's five governmental Areas. The Seitenshi, host and head of Tokyo Area, greets her equivalents from Osaka, Sendai, Hakata, and Hokkaido, and few are willing to lend a sympathetic ear to her attempts at brokering peace. The conference falls into chaos, the Seitenshi shocked that someone leaked out a state secret. The fallout soon brings the two Areas down the path to all-out war with each other--just as the Seitenshi vanishes from the palace!

In the near future, civsecs like Rentaro Satomi and Enju Aihara are humanity's last defense against the viral life-forms known as "Gastrea." But now they're on a different mission, this one straight from the government of Tokyo Area: Stop the rampage of Kagetane Hiruko before he destroys the entire city!