Kannami Yuichi is a "Kildren", a fighter pilot recently sent to Urisu Base to replace a previous one who had died in battle. Like the numerous genetically-engineered pilots before him, he does not age, only to live his life fighting and eventually dying in battle. Rostock and Lautern, 2 different companies have been engaged in a brutal war that has no beginning or end, rather the battles they create serve to "entertain" the peacetime people. Yuichi befriends the base commander, Kusanagi Suito, a woman who endures a long dark past. As their relationship grows, Yuichi learns the bittersweet moments of life, and the inescapable fate he has been placed in.