After the death of their parents, Jessica had to look after her younger brother, she became an ace pilot and expert sniper in the New UN Spacy. However, on one of her missions, there was a friendly fire incident where she sniped and killed her superior officer by accident.
During an investigation it was discovered that Jessica had been having an affair with her superior officer but the night before the mission, he broke up with her. As a result, she was court-martialed for being a suspect in firing intentionally. Some time later she committed suicide.(F: "Friendly Fire")