劇情設置在現代巴黎,中法混血的Marinette Dupain-Cheng(瑪麗內特·杜平-程)是一個普通的中學女生,性格有些猶疑羞澀,夢想成為時裝設計師,暗戀同班的帥氣男生Adrien Agreste(阿德里安·阿格里斯特)。當有壞人威脅巴黎時,Marinette化身正義勇敢的英雄Ladybug(瓢蟲),搭檔愛調戲人的Chat Noir(黑貓),一起打擊邪惡勢力。但Marinette並不知道面具下的Chat Noir正是她一直不敢表白的男生Adrien,而Adrien也不知道自己的暗戀對象Ladybug卻是Marinette。 Set in modern-day Paris, the series focuses on a teenage junior high school girl named Marinette Dupain-Cheng and her classmate and crush Adrien Agreste. When evil arises, Marinette becomes a superhero named Ladybug, while Adrien becomes Chat Noir/Cat Noir. Not knowing each other's true identity, the two work together to protect Paris from a villain named Hawk Moth who covets their powers.