Let's Go to School / Here Come the Materia Sisters Episode 3

Base decides to follow Ao to school, prompting Gourai and Stylet to chase after her. Joined by Ao's model-kit obsessed friend, Bukiko Kotobuki, the girls track down Baselard as she starts stealing shiny things from the school. Later, two more F.A. girls known as the Materia sisters arrive and challenge Gourai and Stylet to a battle. As the Materia sisters prove overwhelming even without any armor, Ao gives Gourai a weapon she received from Bukiko, which successfully manages to defeat the sisters thanks to Stylet's support.