Ao Gennai, who is an ordinary first year high school girl, receives a misdelivered package in one morning. It contains a 15cm-tall fully autonomous "Frame Arms Girl" robot named Gourai. But Gourai is not just a normal Frame Arms Girl robot. She is the most recent prototype that is equipped with an AS (Artificial Self) that is more sophisticated than an ordinary artificial intelligence, and Ao is the only person in the world who can activate Gourai. "Frame Arms Girl Gourai" starts learning about feelings by collecting the battle data, though Ao has no knowledge in the "Frame Arms Girl" system. Then their strange but happy and cheerful daily life begins!