Number of seasons 1

Number of episodes 13

First air date 2016-07-04

Last air date 2016-09-26

Vote average 8.067

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The story begins with Naho Takamiya, a high school student who receives an astonishing letter from her future self, dated ten years ahead. The letter is a mysterious and unexpected gift, revealing detailed predictions of upcoming events in her life. As Naho reads the letter, she becomes increasingly intrigued and bewildered by its accuracy and the personal insights shared within it.

The letter specifically mentions the arrival of a new student, Kakeru Naruse, who transfers into her class. Naho’s future self emphasizes the importance of this event, indicating that Kakeru's presence will significantly impact their lives. The letter suggests that Kakeru is carrying emotional burdens and that his arrival is connected to a series of critical decisions that could alter their futures forever.

A poignant aspect of the letter is the expression of regret from Naho, ten years in the future. Her future self confesses to having multiple regrets about how she handled situations involving Kakeru and other classmates. These regrets highlight the importance of making the right choices now to avoid pain and missed opportunities in the future. The letter encourages Naho to be mindful of her actions and to protect Kakeru from potential harm.

As Naho continues to read, she discovers a disturbing prediction: in ten years’ time, Kakeru will no longer be part of their lives. This revelation deeply surprises her and motivates her to take immediate action. Future Naho asks her younger self to watch over Kakeru carefully, ensuring that she helps him through difficulties and guides him toward better decisions. Her urgent plea creates a sense of responsibility and emotional weight for Naho.

This story explores themes of fate, regret, and the power of choices. The mysterious letter acts as a catalyst, prompting Naho to reflect on her current actions and the importance of caring for those around her. It emphasizes how small decisions can profoundly influence the future, encouraging readers to consider the significance of their own choices. Ultimately, the narrative underscores the idea that even in uncertain circumstances, compassion and awareness can lead to a more hopeful outcome.