The Queen Candidates have another exam, this time held in the Magical World. They're sent to the factory where hearts are converted into energy, and made managers of competing teams of workers. Chocolat bosses around and overworks her team, leading them to go on strike. Pierre decides to send a dragon made of Noir energy to attack the factory, as a declaration of war. Houx and Saule manage to destroy it, but not before it damages parts of the factory and the heart supply...