Marinette and Adrien are two completely normal students - but only almost. The difference is: at the slightest threat to Paris, they transform into Ladybug and Cat Noir. Their mission: to capture the Akumas of the mysterious Hawk Moth, who turns Parisians into villains. The sweet girl Marinette is in love with Adrien, but Adrien's heart beats for Ladybug. Although the two heroes form a team, neither Marinette nor Adrien knows that the other is hiding behind Cat Noir and Ladybug.

All beginnings are difficult, Part 1: It’s Marinette’s first day of school. Master Fu learns that the villain Hawk Moth can empower ordinary people with superpowers using Akumas. Since he is too old to fight against him, he chooses Marinette and Adrien to protect Paris from Hawk Moth's attacks as Ladybug and Cat Noir.

All beginnings are difficult, Part 2: In their first adventure, their classmate Ivan is transformed by Hawk Moth into Stoneheart, a gigantic stone monster. Will Ladybug and Cat Noir manage to save him and all of Paris? A showdown takes place at the Eiffel Tower.