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On a seemingly ordinary day, high school student Naho Takamiya receives a mysterious letter from her future self, detailing events that will soon unfold in her life. The letter urges Naho to take specific actions to prevent a series of regrets, particularly surrounding a new transfer student, Kakeru Naruse. As Naho and her close-knit group of friends navigate the complexities of youth, love, and friendship, they begin to uncover the weight of choices and the possibility of changing fate.