A girl wakes up to a tiny robot with a personality fresh out of the box, and suddenly mecha stops being about war and becomes about two people figuring each other out. Frame Arms Girl knows exactly what it is: a 12-episode advertisement that earns the right to be one by making Gourai's confusion about emotions genuinely charming, and by letting Ao's everyday life stay small and real even when tiny weapons platforms are assembling in her room. The ecchi never overwhelms the comfort, the mecha aesthetic never stops looking cool, and by episode three you stop caring that you're watching a toy commercial because you're invested in whether a proto-AI can understand what it means to have a friend.

Ao Gennai is an ordinary first-year high school student until a mysterious package lands at her door. Inside is Gourai, a tiny humanoid robot called a Frame Arms Girl, built to move on her own and to fight. Gourai is a new prototype with an advanced artificial intelligence that lets her form a personality, learn and grow, and Ao turns out to be the first person ever to switch her on. Knowing nothing about Frame Arms Girls, Ao ends up sharing her daily life with Gourai while the robot gathers both battle data and emotions. Soon more of these intelligent robots start showing up at her home, and with a sizable cash reward on the line, Ao commits to recording as much data on them and their fights as she can. Looking after Gourai proves harder than she expected, especially once competitive battles begin. Based on Kotobukiya's model kit line, the show mixes mecha action with science fiction and ecchi.