Moss belonged to an insurgent cell within the Federation Army, engaged in smuggling and experimenting with the organic bioweapon Ryunka on Earth. The cell operated under the guise of developing countermeasures against hostile forces but conducted unauthorized tests that triggered the catastrophic Ryunka disaster. After the incident, Federation authorities captured most cell members, yet Moss crucially facilitated their escape and regrouping on Earth, where they attempted to restructure operations. These activities drew the vengeful attention of Nataru Shinmoyu, who systematically targeted Moss and her associates for their role in the disaster. During the climax, Moss participated in a confrontation against both Birdy Cephon Altera and Nataru.