Gourai is a test model for Frame Arms Girl that was mistakenly delivered to Ao. When it comes to being a Frame Arms Girl, the system, weapons, and equipment, she is a wealth of knowledge. However, her knowledge is lacking in what human emotions like “happiness” and “sadness” are.

(Source: Honey's Anime)

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.<br><br>

(Source: Anime News Network)