Shu Ouma is a 17 year old teen who has poor social skills who lives in Japan where it is under the strict rule of the government organization GHQ due to the Apocalypse Virus ten years ago. While going to his warehouse studio, he encounters Inori Yuzuriha, internet singer of the band Egoist, who is recovering from her wounds after stealing a formula called Void Genome from the GHQ. After mending her wounds and feeding her, Inori is captured by the GHQ Anti Bodies division led by Major Guin and Shu is powerless to stop them. To make amends, Shu brings the Void Genome to Inori's boss, Gai Tsutsugami, leader of the resistance group, the Undertakers at Roppongi. However, Major Guin orders the Anti Bodies to exterminate the residents of Roppongi in order to find the Void Genome. As the Undertakers and GHQ battle, Shu goes and rescue Inori and protects her when a GHQ Endlave mech tries to attack them. The attack breaks the test tube holding the Void Genome, giving Shu the "Power of Kings" where he pulls out Inori's Void, a large sword and destroys the Endlave.

Shuichiro teleports to the crystal tower but not before giving Segai the information he wants as thanks for his service. Meanwhile, Shu finally recognize who Gai is but he tells Shu to rescue Inori before the youngster, who Gai calls "Death", teleports away. As Shu follows them through a portal, "Death" tells Shu he still doesn't remember his past and causes him to remember.

Ayase, Tsugumi and Argo are shocked on what Gai has done and Daryl is bewildered upon given orders to protect Gai, their former enemy. An UN Stealth Bomber attempts to bomb them but Gai sacrifices the student ring leaders of the coup to destroy the plane. After destroying their Voids, Gai orders Ayase, Tsugumi and Argo to join him or die but are rescued by Daryl who is protective with Tsugumi and blames Gai for making him kill his father. In the confusion of Daryl's insubordination, Inori escapes with Shu while Ayase, Tsugumi and Argo escape on their own and Arisa defends Gai, revealing he was the one who told her to start the coup and joins the Anti Bodies.

Haruka opens a safe guarding the third and final Void Genome, but is stopped by Shuichiro, who is revealed to be her older brother. He confesses that he was the one who killed her husband, Shu's father, before shooting her, but she manages to escape with the Void regardless. An arrest warrant is issued on Haruka, Segai offers to lead the search for her. As she heads to the Kuhouin estate for shelter, her old friend Kurachi tells her the estate is no longer safe now that Okina is dead, and they head to an Undertakers hideout. Arisa is approached by Shu who convinces her to help him rescue Inori, as she wants to learn more about Gai's true intentions.