Ronaldo wird im Kampf gegen den monströsen Septentrion Nummer 4 getötet. Ureu Mono alias Alkor offenbart Hibiki, wer und was hinter den Angriffen der Septentrions steckt.
Hibiki and the rest of the summoners fights against Megrez that have appeared simultaneously in Tokyo, Osaka, and Nagoya. However, Megrez will continuously revived unless the three main bodies are defeated at the same time. As the battle starts, Hibiki and Io summons their demons, along with Hinako who uses Berserker to avenge Keita's death, while Yamato uses his power that increased by the Ryumyaku tower and his demon Baal to stop Megrez' movement until the right moment. During the battle, Hibiki and Io received Ronaldo, Joe, and Otome's death clip that shows them died by Megrez' attack. Hibiki immediately tells Ronaldo to escape, but Ronaldo, Joe, and Otome decides to keep fighting since there are no summoners other than them that can defeat Megrez and resolves to avoid their fate like Hibiki does yesterday. As Megrez comes closer to the tower, Airi, who is enraged that the town where she shares her memories with her family and friends destroyed, summoned new demon, Lorelei, and stops Megrez' movements. After much effort, Hibiki, Yamato, and Ronaldo are able to land an ending blow to the three cores of Megrez at the same time, defeating it. But just before the Septentrion in Nagoya disappears, it uses the last of its strength to launch a final attack on the summoners. Airi and Jungo manage to survive the attack, however, Ronaldo, Otome, and Joe are killed in the blast, leaving everyone, especially Airi, Hibiki, and Io, devastated. As they tries to cope with the devastating loss, Hibiki is approached by Alcor who reveals that he is a Septentrion who works for a being known as Polaris, the cause of the world's destruction. Alcor proceeds to explain that he created the demon summoning app in order to give humans a chance of survival against Polaris's plan to strike judgement on humans by ending their existence. But hope seems lost as the world is slowly disintegrating into the Void.
Hibiki y el resto de los invocadores luchan contra Megrez que han aparecido simultáneamente en Tokio, Osaka y Nagoya. Sin embargo, Megrez revivirá continuamente a menos que los tres cuerpos principales sean derrotados al mismo tiempo. Cuando comienza la batalla, Hibiki e Io convocan a sus demonios, junto con Hinako que usa Berserker para vengar la muerte de Keita, mientras que Yamato usa su poder que aumentó con la torre Ryumyaku y su demonio Baal para detener el movimiento de Megrez hasta el momento correcto. Durante la batalla, Hibiki e Io recibieron el clip de muerte de Ronaldo, Joe y Otome que muestra que murieron por el ataque de Megrez. Hibiki inmediatamente le dice a Ronaldo que escape, pero Ronaldo, Joe y Otome deciden seguir luchando ya que no hay otros invocadores que puedan derrotar a Megrez y resuelven evitar su destino como lo hizo Hibiki ayer. Cuando Megrez se acerca a la torre, Airi, enfurecida porque la ciudad donde comparte sus recuerdos con su familia y amigos destruidos, convocó al nuevo demonio, Lorelei, y detiene los movimientos de Megrez. Después de mucho esfuerzo, Hibiki, Yamato y Ronaldo son capaces de asestar un golpe final a los tres núcleos de Megrez al mismo tiempo, derrotándolo. Pero justo antes de que el Septentrion en Nagoya desaparezca, usa lo último de su fuerza para lanzar un ataque final contra los invocadores. Airi y Jungo logran sobrevivir al ataque, sin embargo, Ronaldo, Otome y Joe mueren en la explosión, dejando a todos, especialmente Airi, Hibiki e Io, devastados. Mientras intentan hacer frente a la devastadora pérdida, Alcor se acerca a Hibiki y le revela que es un Septentrion que trabaja para un ser conocido como Polaris, la causa de la destrucción del mundo. Alcor continúa explicando que creó la aplicación de invocación de demonios para darles a los humanos la oportunidad de sobrevivir contra el plan de Polaris para juzgar a los humanos al terminar con su existencia. Pero la esperanza parece perdida a medida
