Voices of a Distant Star - Makoto Shinkai's animated science fiction film Voices of a Distant Star concerns a fighter pilot who travels into space to fight in an alien war. Mikako braves death in battle while her great love Noboru stays on earth. Their only communication is text-messages. Due to the theory of relativity, Noboru ages years at a time between visits from Mikako, while she ages just days or weeks at a time. ~ Perry Seibert, All Movie Guide - answers.com