When a mysterious alien force begins their annihilation of the human race, a young pilot feels called to join the resistance. But the danger of an interstellar battle is not Mikako's greatest concern. For she has left behind the one young man she loves. And as Mikako flies further into deep space, her only way to connect with Noboru is by cell-phone text messages. While Mikako risks her life to save mankind, Noboru waits. At first days, then months, then years for each new message that will let him know whether Mikako is still alive. And while she barely grows older in the timelessness of space, Noboru ages. How can the love of two young people, torn apart by war, survive?