Juliette Potentis, a curious young girl, learns the existence of the wish that could be made with the Miraculous of the Ladybug and the Black Cat. She suddenly remembers the day she saw Marinette Dupain-Cheng, indiscreetly talking to Tikki months earlier. With intense determination, Juliette embarks on a quest to find the young fashion designer. Meanwhile, in the shadows, Chrysalis is preparing her final strategy like a chess player anticipating the endgame...