To celebrate her hundredth kiss with Adrien, Marinette has planned a romantic evening - forgetting that she'd already planned a movie night with her girlfriends at the same time!
When Adrien gets nervous about meeting his grandparents, Marinette gatecrashes the lunch to support him... unaware that a family war is about to break out.
Adrien has made a new friend whom Marinette is determined to befriend too. But Marinette has no clue how to become friends with someone who doesn't need to be helped.