Before a mysterious package arrived at her doorstep, Ao Gennai was just an average first-year high school student. The contents of the package were even more unexpected- Gourai, a small humanoid robot with advanced AI and combat capabilities, known as a Frame Arms Girl. Gourai was unique in her ability to learn, grow, and develop a personality like a real human. As more Frame Arms Girls kept getting delivered to her home, Ao found herself fully immersed in their world. With a lucrative cash reward as her motivation, she was determined to gather as much information as possible about their battle tactics while also learning about what it means to be human.