Chloé has been harassed by an invisible menace and it's up to Cat Noir and Ladybug to find out who's behind it! After talking with the concierge, they discover Chloé had a fight with Sabrina, claiming that she is no longer her friend and is completely invisible to her. Heartbroken over her words, Sabrina was influenced by Hawk Moth and turned into the 'Vanisher'. As the crime-fighting duo fight the Vanisher, Chloé decides to join in, donning a fake Ladybug costume. However, this causes the fight to be more difficult and Ladybug forces Chloé to leave, claiming that she is endangering not only herself but also the duo. Chloé counters this by saying that the akuma is in Sabrina's rose brooch, but Ladybug disagrees and says it's her bag. It isn't until after Chloé is forced to flee that Ladybug finds out that Chloé's observation was correct. Despite this, Ladybug and Cat Noir end up taking credit. Feeling betrayed by Ladybug and angry that she ended taking credit, Chloé becomes influenced by Hawk Moth and turns into 'Antibug', a darker anti-version of Ladybug.