Let's Go to School / Here Come the Materia Sisters
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.
Aired 18/04/2017EP 3 - Let's Go to School / Here Come the Materia Sisters
Frame Arms Girl
The story begins when Ao opens a package that arrives at her doorstep. Inside the package is Gourai, a Frame Arms Girl: a small robot capable of independent movement. Gourai is a newly-developed prototype: a Frame Arms Girl equipped with an "Artificial Self," an advanced AI that gives her a personality. Ao is the only one that has activated her. Gourai begins to gather both battle data and emotions, starting a day-to-day life with Ao, who knows nothing about Frame Arms Girls.
(Source: Anime News Network)