Lydia is a normal high school student: good grades, good friends, and not much more. But one day, during a Strike, she discovers abilities that will completely change her life as she knows it. Taken into SECTION 4, a special branch of the military, she enters a living hell of violence and death fighting against the [nothing]. As signs of the end of the world begin to appear, SECTION 4 must do everything in its power to prevent the King, an powerful abomination born from the [nothing], from casting the world into the darkness and reigning over an eternal void.