After finishing the fierce battle with Archbishop Orwell, Menou and her companions leave the ancient city of Garm. Seeking a new strategy to kill Akari, they arrive at the port town of Liber, where the Four Great Disasters (Human Error) 《Pandemonium》 is sealed. They are tasked with finding the culprit who is distributing the forbidden item "drug." Targeting the lord's daughter, Manon Liber, as the prime suspect, each of them begins their investigation. Meanwhile, Akari notices that the fate of Menou and her companions, which should only be known to her, is gradually starting to go awry――. A hugely popular work that won the GA Bunko Grand Prize, the unpredictable comic adaptation's fourth volume.