Takahashi Erika got married a year ago and has been leading a happy life with her husband, Takahashi Ryosuke, a company employee, and Kotaro, his young son from an earlier marriage. One day, a man shows up in front of her. He is Tozuka Soichi, her former boss from the Cabinet Information Research Office’s Special Division. Erika had been a secret agent under Tozuka until a year ago. Tozuka has left the Cabinet Information Research Office and is now the head of a company that carries out background checks and investigations into infidelity by making use of his experience from his spy days. He thinks highly of Erika’s skills and would like her to help him in his work. Faced with the threat of having her secret past revealed to her husband, Erika is half compelled to assist Tozuka. The first client is a young lady called Takeuchi Hitomi. Hitomi had signed up with a matchmaking agency and met a doctor by the name of Hayami at one of its parties. The doctor had taken a drunk Hitomi to a private room where he made her drink alcohol laced with sleeping pills and got violent with her. Erika transforms from a good wife and kind mother into a callous spy in order to expose the wrongdoings of Hayami and retaliate against him …
かつて秘密諜報員としてスパイ活動を行っていた主人公・エリカ。現在は結婚し、専業主婦として幸せな家庭の日々を過ごしていた。
だがそんなある日、自宅に内閣情報調査室時代の元上司・戸塚が訪れ、スパイの経験を生かして新たに始めた民間トラブルを解決する仕事を手伝ってほしいとエリカに頼み込む。現場に戻る気持ちはないエリカだったが、家族にスパイだったことをバラすと戸塚に脅され、渋々手伝うハメに。こうして、エリカの主婦とスパイの2つの顔を使い分ける日々が始まった。
家庭主婦繪里香有個不為人知的秘密─她曾是「內閣情報調查室」的秘密諜報員。如今早已金盆洗手的她，與上班族的丈夫及乖巧可愛的兒子，每天過著平凡的幸福生活，直到前上司戶塚突然造訪，以曝光她過去的秘密為要脅，要求繪里香加入他的民間調查公司效力。無奈之下，繪里香開始了截然不同的雙面人生…
