Master spy Twilight is tasked with infiltrating the elite Eden Academy to prevent a war between rival nations Westalis and Ostania. To pull off this mission, known as 'Operation Strix,' he must hastily assemble a fake family, adopting an orphan girl named Anya and marrying a shy clerk named Yor. Unbeknownst to Twilight, Anya is actually a telepath who can read minds, and Yor is a lethal undercover assassin known as the 'Thorn Princess.' As the trio navigates the everyday challenges of suburban family life, they must constantly conceal their true identities from one another and society. Despite the absurdity of their arrangement, genuine bonds begin to form, blending high-stakes espionage and dark humor with heartwarming domestic comedy. Together, they navigate school admissions, neighborhood gossip, and assassination attempts, all while maintaining the greatest secret in the world.