Two high-school students, Marinette and Adrien, are chosen to become Paris’ superheroes: Ladybug and Cat Noir. They each have a Miraculous, a jewel linked to their the magical creatures (Kwamis) that give them powers.Their mission is to keep Hawk Moth – who wants to steal their Miraculouses – from wreaking havoc on the town by creating increasingly dangerous supervillains – all while living their high school lives and keeping their identities secret. At school, Marinette has a crush on Adrien but cannot tell him, so she acts awkwardly whenever he’s around. As a superhero, Cat Noir loves Ladybug, but his ego annoys her: Marinette prefers Adrien anyway! Throughout the school year and their adventures, Ladybug discovers many nice qualities in Cat Noir while Marinette grows ever closer to Adrien, making huge efforts to overcome her shyness.

Marinette tries to find ways to get closer to Adrien, but Ladybug and Cat Noir have their hands full with the akumatizing havoc wreaked by Hawk Moth.

Marinette and Adrien's relationship finally takes a cautious step forward, but Kagami -- and the future of Paris -- stand in their way.

Not only is Marinette Ladybug, the superheroine that protects Paris from the attack of villains, but she’s also now the guardian of the Miraculous. This means that not only does she need to keep her identity hidden, but also the existence of these turbulent, magical creatures, the Kwamis! Marinette has a lot of pressure, not to mention her school and love life! Now she has less time and opportunities to tell Adrien her feelings... Marinette now has to redouble efforts to protect her secrets and Ladybug will have to become stronger to face an indomitable adversary: Shadow Moth, who can now fuse the Butterfly and Peacock Miraculous! Thankfully, Ladybug can count on Cat Noir and their new superhero allies!

Marinette has lost the miraculouses and the kwamis. She is only with her miraculous and Cat Noir with his. Shadow Moth has never been so close to victory. Now he can give his akumatized persons miraculous powers to create ultra-powerful supervillains. But our heroes working together again in duo, will be more united than ever. This new trial will deeply mark their relationship and their private life. Nothing will be like before.