[Machine Translation] Alec and his S rank party, "Endless Days", head to Red Rogue, the "city without night", to investigate the second "Arcadian dungeon" that occurred due to an irregularity. The guildmaster, Rosa, reveals the truth. It is... -The sudden outbreak of "Labyrinth Disease". -The "Arcadian dungeon" simulacrum that has been created. -The creation of artificial dungeon cores as a possible cause. And all of this was happening intensively during the "Flame Night Festival," which is held once every three years in Red Rogue. In a moment of the festival, the "Endless Days" group sees... The long-awaited third installment of the adventures of a former court magician who was left in a state of captivity!