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.

While the virus is still spreading over Japan, Daryl arrives at the airport and kills everyone there in a rage of fury, including his own father Major General Yan. With the GHQ higherups gone, Shuichiro took over control of the entire military, and declares that the Funeral Parlor spreaded the disease as an act of terrorism. Meanwhile, after an call from Tsugumi, Shu finally regained control over himself. He then gathers Hare, Souta, Yahiro, Kanon, and Arisa, and explained to them that he wanted to go and rescue Gai and Inori. After witnessing Shu's power to draw out voids, the five students agreed to tag along. Back at the GHQ Headquarters, Haruka managed to escape from Shuichiro, but bumped into Inori and Gai. With Haruka's help, Inori was able to sing and broadcast her song "Departure" all over Japan. The song was able to reverse the effects of the Apocalypse Virus. At the same time, Shu and his friends arrives at the GHQ HQ, breaking through the barricades using different voids. When Shu finally reached Inori, a blond-haired boy appeared from behind and withdrew Inori's void, then sliced down on Shu. But Gai appeared and took the hit, saving Shu. The episode ends with Shu holding the unconscious Gai, while Shuichiro and Segai enters the Gate of Hell leading to Cocytus.

As the combine forces of the Undertakers and the UN forces arrive at GHQ Headquarters, realizing the 256 Leukocyte satellites was a bluff, Shu helps Ayase into her new Steiner Endlave and promises his friends and allies that they will rescue Inori and stop Gai. As the UN forces attack, Gai uses Yuu, Kenji and Arisa voids to decimate them and Shuichiro orders the GHQ/Anti Bodies/Daath forces to destroy them. Daryl is forced to join the attack in his new Gespenst Endlave due to having his void taken. Thanks to Tsugumi's void, Shu and his Undertakers/PMC allies manage to sneak inside and hack into the base system, allowing the UN the chance to counterattack. As Tsugumi group split up with Shu and the others, Gai prepares to get rid of Inori's memories before Mana can take over her body but ask her why she loves Shu.