The setup promises magical girl action with real institutional weight, these aren't rebels, they're state-sanctioned demon slayers in school uniforms, which creates constant friction between duty and being a teenager. The show commits to that tension early, then pivots hard into conspiracy and betrayal that rewires everything you thought you understood about who these girls actually serve. It's a show that trusts you to notice when the government stops being the ally and starts being the problem.

Aratama are strange, hostile beings that threaten the human world, and since ancient times shrine maidens armed with swords have fought them off. These girls, called Toji, wear school uniforms and blades and serve as an official special police unit authorized by the government. Five schools across the country train them, and between ordinary school days they take up their swords to protect people. Kanami Etou is picked to represent Minoseki Academy in a sword fighting tournament held among the five schools, where she meets the mysterious Hiyori Juujou. As the two advance to the top, their match takes an unexpected turn that throws the Toji into chaos. Suspecting betrayal from within, Kanami and Hiyori flee the tournament and find themselves fighting former comrades along the way.