The story follows the girls of , spies for the Commonwealth hidden in plain sight as students of the prestigious Queen’s Mayfair School .
: As Chise and Beatrice provide backup from the rooftops, the team realizes the "dirty" Cavorite isn't for war—it's being used to fuel a massive airship intended to smuggle these children across the wall to the Commonwealth. Princess Principal
: Control has received word of a new underground factory in the London slums producing "dirty" Cavorite—unrefined ore that causes a lethal, glowing "Cavorite sickness" in the workers. The story follows the girls of , spies
: Ange , the stoic master of lies, and Dorothy , the group's experienced leader, infiltrate a high-society gala held by a Duke suspected of funding the operation. While Dorothy uses her charm to distract the guards, Ange uses her Cavorite ball to silently scale the manor’s walls, defying gravity to reach the Duke’s private study. : Ange , the stoic master of lies,
In the end, as the sun rises over the wall, the team sips black tea back at the school, another page of their story written in shadows and half-truths.