The Mars Exploration Project was destroyed by an alien attack in 2039. Seven years later, the UN is launching a deep space mission in search for the aliens. Mikako and Noboru have just finished tests, and are going to high school... or so was the plan. Mikako is drafted as a pilot for the UN mission, separating them. When she goes to space, their only communication is by e-mail, which takes longer and longer to arrive as the UN ships travel out of the solar system. Will their love survive the distance and void of space?