Tokitou Haruto lost all of his friends in middle school because of a Science Fiction novel he read. He started calling men “Kei” and the ladies “Florlain,” which spread throughout the school. Unable to cope with the sudden exclusion, he isolated himself. One day at high school, the classroom becomes perfectly still. Having experienced this time-stop multiple times, he wonders if this is actually a dream. All of this doubt stops when he meets Sakazaki Kuon. She is part of a team who defends the world from monsters who attack the world using this time-stop dimension: Kohakjal. What relation does Haruto have with a group who fends off time-stop monsters?