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One day, Naho Takamiya receives a letter written to herself from ten years in the future. As Naho reads on, the letter recites the exact events of the day, including the transfer of a new student into her class named Kakeru Naruse. The Naho from ten years later repeatedly states that she has many regrets, and she wants to fix these by making sure the Naho from the past can make the right decisions—especially regarding Kakeru. What's more shocking is that she discovers that ten years later, Kakeru will no longer be with them. Future Naho asks her to watch over him closely.
Nadeshiko, a high school student who had moved from Shizuoka to Yamanashi, decides to see the famous, 1000 yen-bill-featured Mount Fuji. Even though she manages to bike all the way to Motosu, she's forced to turn back because of worsening weather. Unable to set her eyes on her goal, she faints partway to her destination. When she wakes up, it's night, in a place she's never been before, with no way of knowing how to get home. Nadeshiko is saved when she encounters Rin, a girl who is out camping by herself. This outdoorsy girls story begins with this first encounter between Nadeshiko and Rin.
A young biker stumbles onto a prototype motorcycle with a hidden function that has a link to the true nature of his world.
