Promises. Everyone makes them, even if they don't fulfill them. This specific promise was important. It was the sole reason someone was able to become her own person. The reason why someone was able to sprout their wings and fly. The reason someone achieved her dreams. The reason someone would become stronger. Alya Césaire made that promise to her best friend. They were inseparable, but in a blink, Alya moved. She found someone new to be her best friend. Her actions afterwards were driven by the promise she had made to the best friend she had been separated from. (Brief mention that in this story, Marinette and her class never went to New York, so we've changed Jess and Aeon's storyline) CW: contains bullying