Since ancient times, shrine maidens, through their Okatana, cleanse grotesque beings called Aradama that threaten the human world. These girls, wearing their swords and uniforms as their main attire, are called Toji.

These girls are mostly students of pre-adult age who perform policing duties while studying in one of five middle-and-high integrated training schools throughout Japan.

Despite spending a normal school life, these girls, upon the call of professional duty, wield their swords, manifest paranormal powers and fight to protect humanity.

"Alright! Then, let's promise to have a rematch!"

One spring, Toji chosen from all over Japan are gathered, and a tournament that faces off different skills is held. Kanami Etou, who heads to the tournament venue in Kamakura as representative of Gifu's Minoseki Academy, and Mihono Asakura, the girl who lost to Kanami in the preliminaries and is seeing her off. The two Toji friends exchange promises of a rematch.

This promise is that even if the Toji they head towards changes, their power will remain bound to each other...

[from Wikia]