In a world plagued by corrupt politicians and warmongering forces, the accomplished spy 'Twilight' risks his life on perilous missions to maintain peace between the neighboring nations of Ostania and Westalis. Operating under the alias 'Loid Forger' in the bustling city of Berlint, Twilight infiltrates the elite Eden Academy to gather intel on elusive politician Donovan Desmond. With the help of the unmarried city clerk Yor Briar posing as his spouse and the young orphan Anya as their daughter, Twilight weaves a web of deceit. As Loid navigates the challenges of masquerading as a loving father and husband, he discovers that his new family harbors secrets of their own: Yor is a covert assassin dubbed 'Thorn Princess,' and Anya possesses telepathic abilities. Despite the foundation of their bond being built on lies, the Forgers learn that their affection for each other transcends their hidden truths, fostering a genuine connection amidst a web of deception.