When Ao found the package on her doorstep, she thought it was a present from her father, but inside the box was something truly unexpected: Gourai! A Frame Arms Girl, Gourai is a walking, talking, miniature artificial person with the intelligence of a ten-year-old human and a selection of snap-on weapons and armor. And the reason Gourai needs armor quickly becomes clear as two more Frame Arms Girls, Stylet and Baselard, arrive intent on testing Gourai’s combat capabilities! It seems that Ao has been chosen to help test a new toy line and the good news is that she’ll get paid for hosting her diminutive charges’ battles! Of course, since they’re mainly interested in fighting and gathering information, things are going to get awkward when they follow her to school in FRAME ARMS GIRL!