Adrien makes 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.
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.
While helping Adrien unpack boxes of childhood souvenirs, Marinette finds a letter with secrets that could hurt him. Should she hand it over or keep it a secret?
Marinette and Adrien, the most famous couple in Paris, attract the attention of an unscrupulous influencer who will do anything for repercussion - even destroy the love between them.
While trying to hide her seasonal cold from Adrien, Marinette tries to help Nathaniel assert himself so that he can draw the next strip of the comic book that Marc has written for him.