17 parts Complete Summary:
2 teenagers, Marinette and Adrien, receive ancient magical trinkets that allows them to transform into superheroes Ladybug and Cat Noir in order to protect the city of Paris from the evil menace Hawk Moth.
Plot Summary:
In modern day Paris, 2 teenagers, Marinette Dupain-Cheng and Adrien Agreste, use magical ancient artefacts known as the Miraculous to transform into their hero personas Ladybug and Cat Noir when evil arises. Marinette carries the Earrings of the Ladybug and Adrien carries the Ring of the Black Cat. Marinette is crushing on Adrien and Cat Nor is falling for Ladybug, but neither of them know they're in love with each other.
Their archenemy is Hawk Moth, later revealed to be Adrien's father Gabriel Agreste, who uses his own Miraculous, the Locket Brooch of the Butterfly, to turn people into supervillains when they feel negative emotion using small butterflies called akumas. He intends to gain the heroes' Miraculous to grant himself the wish of resurrecting his wife Emilie, who fell prey to using the damaged Brooch of the Peacock and fell into a coma, which will bend reality as they know it.
Over the course of the series, as Hawk Moth's minions grow tougher, the heroes get help from Master Fu, the guardian of the Miraculous, who allows the heroes to borrow other Miraculous and recruit more heroes to help them, mainly Marinette and Adrien's classmates. Hawk Moth later gets the assistance from Mayura, a villainess using the damaged peacock using feathers called amoks to create sentimonsters, lifeforms created from someone's emotions, becoming his new partner in crime.
Despite all the heroes they recruit and all the enemies they face, both Ladybug and Cat Noir promise each other it is thew 2 of them against the world.