Agent Twilight, the greatest spy for the nation of Westalis, has to infiltrate an elite private school. In order to do so, he assumes the identity of psychiatrist Loid Forger, adopts an orphan girl, and marries a city hall employee. Unknown to him, his daughter Anya is a telepath and his wife Yor is an assassin. The three learn to become a family while working to complete Twilight's missions and maintain world peace.