Seven Seas P.,N.Y. orange: The Complete Collection 2

Everyone has regrets in life. So who wouldn't take the chance to change the past if given the opportunity? When Takamiya Naho receives a mysterious letter, claiming to be from her twenty-seven-year-old self. 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.