Marinette and Adrien prepare to have a normal date at the pool, but this proves to be very traumatizing for Marinette because she once had a crush on Kim last year and Chloe pulled a series of nasty pranks on her. Socqueline is able stop Chloe from posting a humiliating video of Marinette by destroying Sabrina's phone, but she ends up getting suspended. Socqueline gives Marinette some words of encouragement to help her stand up to Chloe. Marinette is able to calm herself and she rejects the megakuma. When Adrien and Ondine learn about Kim's prank, the two become angry at Kim for hurting Marinette. Kim soon gets akumatized by Monarch into Dark Humor and he is granted the power of derision through his alliance ring, he forces everyone to do a series of unpleasant jokes. Ladybug is able to defeat Dark Humor by pretending to be brainwashed by him and Kim is given a magical charm, the heroine tells him that his practical jokes will lead to consequences. At the pool, Ondine harshly scolds Kim for hurting Marinette and he looks at the charm Ladybug has given him, Kim apologizes to Marinette for what he did and she forgives him. Marinette is still uncertain over her feelings for Adrien, but he assures her that they will have time to figure things out. Adrien angrily confronts Chloe for playing a nasty prank on Marinette and for allowing Kim to hurt her, he advises Chloe to apologize to Marinette, but she refuses. Adrien comes to realize that he has given Chloe one too many chances to change and he ends his friendship with her for good. After Adrien leaves, Chloe calls her former friend a traitor.
