The story begins with the protagonist, an 18-year-old Marchioness, suddenly recalling her past life as a 52-year-old Japanese housewife. This memory retrieval is a turning point, lifting her deep depression and revealing the truth of her miserable current existence. She realizes she has been systematically gaslit and emotionally abused by her husband, the Marquis's heir, and the entire household, particularly the Head Maid. They have convinced her she is a selfish, arrogant, and wasteful nuisance, undeserving of her position, while openly supporting her husband's affair with a commoner florist. The protagonist, who was once a doting daughter of a powerful Count and a former Princess (making the King her uncle and the Duke her great-uncle), had been isolated and made to believe her low status (compared to her husband) and lack of contribution justified her mistreatment.
Empowered by her past life's common sense and newfound resolve, the protagonist decides to reclaim her dignity. She challenges the Head Maid's disrespectful behavior and, in a calculated move, reveals her formidable royal lineage and vast personal wealth by handing over letters addressed to her royal relatives and parents. The Head Maid, a Viscount's daughter who rose to power by facilitating the husband's "true love" narrative and despising the protagonist, is utterly terrified upon realizing the immense gravity of her actions.
Meanwhile, the protagonist's doting father, the Count, and her mother, the former Princess, receive her carefully worded letter, which paints a picture of extreme suffering and neglect. They are enraged and heartbroken, realizing their daughter's "happy marriage" reports were fabricated. They learn the Marquis's family is not only disrespectful but profoundly incompetent, having fallen for scams and even attempting to harm the florist's family (though failing to kill the florist). The Count, who had previously sabotaged his daughter's relationship with the Second Prince to keep her close, now deeply regrets his actions, acknowledging the Prince would have protected her.
As the Marquis's heir and the florist enjoy a romantic getaway at a "secret lake villa," oblivious to the impending doom, the Count mobilizes the royal family. The Second Prince, the protagonist's cousin and former suitor, arrives at the Marquis's mansion with a grand retinue, immediately arresting the entire household. The protagonist is rescued, but to her dismay, the Prince presents her with a marriage annulment, not a divorce. This means she is once again an unmarried noblewoman, potentially facing another arranged marriage, rather than her desired peaceful retirement in a monastery on her family's lands. The Marquis, her father-in-law, is left in shock and incomprehension, having just received the annulment papers, demands for restitution, and an astronomical compensation claim, his world crumbling around him. The chapter arc concludes with the protagonist's liberation and her family's furious determination to utterly destroy the incompetent Marquis's family, while the antagonists remain largely deluded or in terror of the consequences.