When villains threaten the city of Paris, Lena Ackerman takes up the mantle of a Ladybug heroine named Mudangbeolle, having been given the Miraculous by her Godfather. Knowing she needs help, she meets two teenagers, Roux Rossi and Adrien Agreste, and gives them the Butterfly and Black Cat Miraculous respectively, transforming them into crime fighters Chrysalis and Chat Noir. As secrets and hearts collide, the trio set off on a daring mission to defeat any villain in their path. From the ghastly catacombs of Paris to the dazzling heights of Notre-Dame, it is ultimately love that sweeps them on an unforgettable journey.