Ryuko Matoi, a vagrant transfer student armed with a scissor-shaped longsword that can cut Goku Uniforms, arrives to Honnō City to find the murderer of her father Isshin Matoi. Her search leads her to enroll in Honnouji Academy, a militaristic high school ruled by the student council president Satsuki Kiryuin and her Elite Four through the power of a fabric called Life Fibers