Set in the Front Mission universe, the story unfolds during a sudden invasion of the Ruthenian border city of Novo Slava by the neighboring nation of Garmoniya. Across fourteen chapters, players follow three protagonists caught in the chaos: Mikhail, a young mecha pilot who loses his unit in the opening assault; Olga, a police captain and former soldier now defending the city she calls home; and Leonid, a former rebel leader framed for a high-profile assassination. As they fight to survive the war-torn streets, guiding civilians to safety and evading the towering combat mechs known as Wanzers, their paths converge and reveal a darker conspiracy behind the invasion.