The next morning, Marinette brings her earrings to school and slips them into Alya's bag, still upset for forgetting to purify the akuma and convinced Alya would be a better Ladybug. Adrien sneaks to school, desperate to leave his house and make friends. Questioned by his classmates, nobody believes Ivan when he claims not to remember anything; he storms off in anger when Chloé mocks him. Marinette comforts Ivan; encouraged by her, Ivan sings Mylène a love song, but accidentally scares her off. Ivan turns into "Stone Heart" again with Hawk Moth's akuma, and takes control of his duplicates around Paris, which come to life. Stone Heart breaks into the classroom, grabs Chloé and Mylène and runs off, summoning his duplicates. Adrien rushes to stop Stone Heart as Alya takes chase to film the battle; Marinette runs after her, wanting to pass her the earrings. Stone Heart's duplicates catch Cat Noir as he saves Alya from being crushed by a flying car. Marinette has no choice but to transform; breaking Cat Noir out, they rush to Trocadéro. Ladybug catches Chloé when Stone Heart throws her towards Pont d'Iéna from the Eiffel Tower's lower deck. A swarm of akumas fly out of Stone Heart's mouth, forming Hawk Moth's face, who declares that Paris will be spared if Ladybug and Cat Noir's Miraculouses are surrendered. Ladybug refuses, stating that Hawk Moth is the one at wrong, and cleanses the akuma cloud. Hawk Moth orders Stone Heart to take their Miraculouses; he and his duplicates begin to climb the Eiffel Tower. Ladybug climbs to the top of the tower, using her yo-yo to make Mylène kiss Stone Heart's chest; surprised, he drops the paper ball the akuma is in. Ladybug crushes it and cleanses the akuma. After her magic cleans up the damage, Ladybug passes Mylène Ivan's song lyrics. Mylène hugs Ivan; Ladybug and Cat Noir run off to transform back. Later, Adrien's father allows him to go to school while Marinette stands up to Chloé, retaking her seat. That evening after school, it's raining outside; Adrien hands Marinette his umbrella, and the two share an intimate moment before parting ways. Master Fu and Wayzz watch from afar, satisfied with their decision to give them the Miraculouses.
Elenco: Annouck Hautbois , Benjamin Bollen , Marie Nonnenmacher , Antoine Tomé , Fanny Bloc , Marie Chevalot , Thierry Kazazian , Jessica Barrier , Alexandre N'Guyen .