Koji Aiba, who had been living a school life unrelated to girls, suddenly encounters a mysterious phenomenon called "Lost Time" where time stops for one hour a day. Takashi, who is trying to regain his youth in such a static world, meets Tokine Shinomiya, a girl with amber eyes who can also move in the stopped time. In a world where only the two of them can move, they gradually grow closer and closer, and eventually his feelings for Tokine turn into his first love. However, she seems to be harboring a big secret that blocks her feelings.