ウマ娘 プリティーダービー 3rd EVENT WINNING DREAM STAGE (Uma Musume Pretty Derpy 3rd EVENT WINNING DREAM STAGE) is event, which was held on August 28-29th 2021 at Tokyo Garden Theatre.

Ayaka Goma works as a police sergeant. One day, a demonstration is held and a hostage situation occurs at Shinsekai Finance. Someone calls the Tokyo Metropolitan Police Department, demanding that Ayaka come to the demonstration site as a negotiator.