When Marinette and Zoe are chosen to organize the end-of-school-year party, Marinette learns that Zoe is secretly in love with someone in ninth grade at school. Zoe says that she cannot talk about it. To Marinette, this can only mean one thing: Zoe is in love with Adrien! But before she finds out whether she is right or not, a common enemy of the girls will try to ruin their beautiful friendship