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On the day that Naho begins 11th grade, she recieves a letter from herself ten years in the future. At first, she writes it off as a prank, but as the letter's predictions come true one by one Naho realizes that the letter might be the real deal. Her future self tells Naho that a new transfer student, a boy named Kakeru, will soon join her class. The letter begs Naho to watch over him, saying that only Naho can save Kakeru from a terrible future. Who is this mystery boy, and can Naho save him from his destiny? Includes the first chapter of the bonus story, Haruiro Astronaut!