The Conscious City.In a flashback, three powerful fighters wielding the Heaven's Blades begin to fight a giant contaminoid named Limbeekun that has attacked a regios. In the present, Layfon Wolfstein Alseif leaves his regios to attend the academic city of Zuellni. Meanwhile, Nina Antalk loses one of the members of her platoon, and is forced to search for recruits. Layfon arrives in Zuellni as two students start a fight, and cause a building to collapse on another student, Mayshen Torinden. After receiving a telepathic command to save her, Layfon spirits her away from the building with incredible speed. He meets with the president of the student body, Kalian Loss, who forces him to enter a military arts platoon, and Nina, who witnessed Layfon saving Mayshen, recruits Layfon into the 17th Platoon. Afterwards, Layfon meets Felli Loss, another member of the 17th Platoon who sent Layfon the telepathic message earlier. That evening, Layfon recalls that he was one of the fighters wielding the Heaven's Blade against the giant Limbeekun in the past.