Katra Aima is just a regular high school student—aside from the fact that she feels like she’s in a cage; tied by the chains pretending to be a bracelet in her wrist. It has been a century since the world has discovered Reins; people who have superhuman abilities. For decades Reins and the norm have lived in harmony. Yet—Katra found herself in the middle of a war. And she must choose whether to fight or to run for her life.