In an alternate future, the Cold War has persisted for 140 years, dividing Earth into the East Block and the West Block. Despite a facade of peace, the two sides engage in a covert war, constantly threatening nuclear conflict. Mylene Hoffman, a top-tier spy for the Western Bloc's elite Zero Zero organization, navigates this world of espionage and assassins. She uses her skills to confront enemies in a conflict that, despite its intensity, is characterized by a lack of overt bloodshed.