After escaping from the cell where he was locked up, Kyklo goes to Shiganshina district, where he was born fifteen years earlier. There, the Exploration Battalion, freshly reformed after a long period of inactivity, is preparing to leave for an expedition outside the walls. Kyklo decides to join it clandestinely to finally be fixed on his own nature, but the hell that he discovers far surpasses everything he had imagined!