As the gang comes up with yet another overcomplicated plan to bring Marinette and Adrien together, Lila uses her talent for manipulation to persuade Kagami that Marinette is a liar who abuses everyone else's kindness. Shocked, Kagami is akumatized into Riposte Prime. She lays into Marinette at the very moment when Adrien had managed to finally make her feel comfortable around him. Will Lila's poisonous lie ruin the friendship between Kagami, Marinette and Adrien?