In Paris, 1891, Mr. Agreste is the newest and most eligible bachelor in town for the Season, catching the eyes of dozens of heartstruck ladies, though it is only one who truly manages to capture his attention and she is not among those in the elegant ballrooms (or so he believes), but beside him on the rooftops of the City of Lights masked and ready for action.
Even when an arranged marriage is meant to tie him to the delicate Ms. Marinette Dupain-Cheng, his heart can't help but ache for his lady of the night, his one true love, his Ladybug.
Marinette Dupain-Cheng is an average peasant girl growing up in a small village named Parisilia. It is strictly under the rule of King Gabriel. Since her father was murdered by the King's men years ago, she has learned to fend for herself with the help of her friend Alya.
Living in the village isn't easy, especially when the taxes are raised and getting by is made increasingly difficult. So Marinette has to do something about it. But how could she as an average peasant girl? Her plan is to overthrow the kingdom. Feeing hopeless, Marinette nearly tosses aside this idea. On a cold and dreary night, when a fairy godmother grants her biggest wish, she has the ability to transform into Ladybug, a spotted hero who will demand change for the village. But she'll find that it's easier said than done when she unexpectedly meets Prince Adrien.
Will Marinette ever have a happy ending without jeopardizing the lives of the ones she loves?