When sixteen-year-old Takamiya Naho receives a mysterious letter, claiming to be from her twenty-seven-year-old self, her life is suddenly thrown into flux.
What is Naho to make of the letter\'s contents?.
The letter informs her that a new transfer student by the name of Naruse Kakeru will be joining her class, and to keep her eye on him.
When sixteen-year-old Takamiya Naho receives a mysterious letter, claiming to be from her twenty-seven-year-old self, her life is suddenly thrown into flux