Prior to the beginning of the series, La Musique was invaded by the sorceress Lilith and her generals, the Evil Tunes, and turned everyone into a monster called a Namida. Lilith's goal was to capture the Top Designers, and force them to make her an Aria dress, and with it, Lilith would be able to destroy all forms of music. The Top Designers, however, fled La Musique, but not before sending the fairy Cadence to Earth in order to look for the legendary warriors, Pretty Cure.
In Episode 5, the history of La Musique is revealed. La Musique was a magical land where people used the Star Cards to perform concerts. One day, the Top Designers and the princess were visited by a little girl named Lilith, who asked the Top Designers to make her an Aria dress so she would become a better idol than anyone else. However, the Top Designers refused, and the princess tried to explain kindly to Lilith that although every idol are rivals, they all have the same wish - to spread music and joy everywhere. A downhearted Lilith ran away from La Musique, vowing to destroy all forms of music, and went to a mysterious place. Here, Lilith began to practice dark magic, and created Noir. When her magic was strong enough, Lilith went back to La Musique and fought against the princess, but Lilith easily overpowered the princess, and quickly destroyed all of La Musique in an attempt to find the Top Designers. The Top Designers, however, managed to escape to Earth, but Lilith sends her minions to search for them, and with each Namida created, Lilith grows more powerful.