If you are looking for a physical "repack" that includes these episodes, several retailers like eBay and Etsy offer comprehensive collections:
The BN no Chikai Repack event in Uma Musume Pretty Derby is a must-experience for fans of the game. With its new storyline, gameplay features, and exclusive rewards, the event offers a fresh and exciting experience that is not to be missed. Whether you're a seasoned player or new to the game, the BN no Chikai Repack event is an excellent opportunity to explore the world of Uma Musume and experience the charm and excitement of this popular mobile game.
Uma Musume: Pretty Derby - BNW no Chikai (The Oath of BNW) is a three-episode original video animation (OVA) series that serves as a side story to the first season of the Uma Musume anime. Plot Overview
The BN no Chikai Repack event introduces several new features and rewards, including:
[Rewatch] Uma Musume: Pretty Derby OVA 2 Discussion : r/anime