Marinette leaves Paris when the last battle is over. All she leaves is a note asking people not to look for her, telling them that she'll be fine. Once she gets to Gotham, crime captial in the world she is strangely enough offered a kind of sanctuary with Poision Ivy that ends up extending to Harley Quinn and Selina Kyle as well. She wants to find herself, who she is beneath the mask, but it's a long way there. (i do not own or make money on DC or Miraculous Ladybug) (picture isn't mine. It's from The dark knight rises)
4 parts