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Naho Takamiya, a second-year student in Matsumoto, opens a letter that claims to come from herself ten years in the future. It asks her to watch over Kakeru Naruse, a transfer student from Tokyo joining her class, and to change the choices that became her deepest regrets. As Naho and her friends Suwa, Azusa, Takako and Hagita welcome Kakeru, she has to weigh each prediction in the letter against the ordinary days unfolding around her.