The events of this special take place between season 3 and season 4.
This episode reveals the existence of another Miraculous, the Eagle Miraculous, and by extension, the Eagle Kwami, named Liiri. It also confirms that, while the Miracle Box is located in Paris, there are many more Miraculous that exist all over the world.
On August 8, 2020, during Brazilian Miraculous Day, voice actors read a scene from this special: the scene where Cat Noir tries to give Ladybug a yellow rose. He explains that Ladybug refused the red rose because it symbolized love, while white represents purity. This time she needs to accept the yellow rose because it represents friendship, and Cat Noir proposes a toast for their friendship.
One day later, on March 21, Thomas Astruc posted on his Twitter a few seconds of animation with a new character that will appear in Miraculous New York special. Feri González confirmed it to be Sparrow, one of New York's superheroes.
On October 19, 2019, ON Animation Studios and Method Animation announced that they were looking for crew members to help create storyboards for the latest special episode. It was added at the time that it would be a new 52-minute episode set in New York City and titled "Miraculous New York".