Cecily features in the second segment of *Mobile Suit SD Gundam Festival*, "SD Gundam Sidestory: The Legend of the Holy Machine Soldiers." Initially living under the alias Cecily Fairchild in Lugash Village, she is the hidden daughter of the Ronah family. Her distinctive earrings mark her as a target for the Neo Zeon Clan, as they are one of the keys required to awaken the ancient Holy Machine Soldier. Captured by the Neo Zeon Clan, her true identity is revealed as Princess Berah Ronah. The Clan seeks to exploit her lineage and the power of her earrings to revive the Holy Machine Soldier, intending to conquer the Dabat Kingdom and the wider Saddrac World. Her presence and the significance of her earrings directly drive the plot conflict, intertwining her fate with Knight Gundam GP01, Heavy Knight GP02, and their allies who strive to protect Dabat and prevent the Clan from harnessing the weapon's power.