The events take place in a school run by the student council president Satsuki Kiryuin, who wields brute force. The arrival of new student Ryuko Matoi, wielding a sword in the form of half of gigantic scissors, shakes the foundations of school life. Ryuko is occupied with searching for the mysterious murderer of her father. But members of the student council become obstacles on her path. Fortunately, Ryuko finds an unusual talking school uniform that gives her additional powers.