Yuko's birth place is still unknown. Her parents were engineers and their whereabouts are also unknown. From her youth Yuko is dreaming to explore the universe, traveling through wormholes and landing on undiscovered planets.
Intelligent and stubborn by nature, Yuko graduated with honnors from the pilot academy. Willing to improve her skills for exploration but also in combat, she joined LONE STAR to start her career.
Yuko is focusing all her efforts to learn and improve herself. Eventually a career as explorer awaits her...