Everyone conceals a hidden side of themselves from the world, and this includes "Twilight," the most skilled spy employed by Westalis Intelligence Services. The Eastern-Focused Division of the country has tasked Twilight with investigating Donovan Desmond, chairman of Ostania's National Unity Party, who threatens to undermine the peace talks between Ostania and Westalis. The long-running cold war between both nations is seeking the upper hand, but Twilight's mission, called "Operation Strix," is crucial to winning the battle. To infiltrate the social gatherings hosted by the elite school attended by Desmond's son, Twilight is required to assemble a family unit in under a week's time. Playing the part of psychiatrist Loid Forger, Twilight starts his search for family members and quickly discovers that his adopted daughter Anya has telepathic abilities, while his wife Yor is an experienced assassin. They understand that keeping their true identities hidden is necessary for the mission's success, and so they live together and exercise caution. This unconventional family embarks on a new adventure packed with unforeseeable twists that will determine world peace's destiny.