Loid Forger, an elite spy known as Twilight, is given a mission that requires him to create a family in order to get close to a political target who is extremely difficult to reach. He adopts Anya, a young girl who can read minds, and marries Yor, a quiet office worker who secretly leads a double life as a professional assassin. None of the three truly knows the others’ real identity. Between espionage missions, school life, secrets, and unlikely family situations, this fake family tries to keep up appearances while gradually developing bonds far more genuine than expected.