Hilde Thorvald serves as one of three DEVA security officers dispatched to pursue Angela Balzac and Frontier Setter after they defy DEVA's directives, operating alongside teammates Christine Gillum and Veronica Kulikova. During the mission on Earth’s surface, she pilots an Arhan unit into combat against Angela Balzac and Dingo, reporting the landing of enemy assets including one advanced Arhan unit and seventeen equipment containers. When jamming smoke disrupts satellite monitoring, she requests infrared scanning to locate targets. Her Arhan unit is caught in a trap as Dingo detonates explosives on a bridge, collapsing it onto her mecha. After the team’s defeat and mission failure, Hilde witnesses Frontier Setter’s rocket launch from Earth alongside her fellow agents.