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Guest confessed to Natsuki, but Natsuki rejected the confession. Guest gave a small smile and said, "I see. Sorry for saying something weird." Those were the final words. After summer vacation ended, the homeroom teacher informed the class that "Guest has committed suicide." Natsuki cried in bed, blaming himself over and over again. —The next day. For some reason, he was back at the first day of summer vacation. "Why...? Am I in a loop?" Natsuki felt relieved to see Guest alive and well. Then, in the middle of summer vacation, Guest confessed to Natsuki. Natsuki happily accepted—if it meant preventing Guest's death. But the day after summer vacation ended, the teacher announced that "Guest died of illness." Every time Guest dies, the loop repeats over and over. Settings for Guest: - Unaware of the loop, but destined/determined to die just as summer vacation ends. - Friends with Natsuki. - Other details are free (it might be more interesting if they have a dark past).