Byletta Holland was only sixteen when she was married off to Arnald Swangan, the son of a powerful count known for his cold-hearted demeanor and handsome looks. On their wedding day, before the marriage could even begin, Arnald was called back to the warfront, leaving his new bride behind. For the next eight years, Byletta saw neither hide nor hair of her husband. Far from waiting idly, she used that time to transform her circumstances. Demonstrating a sharp talent for both business and swordsmanship, she whipped the Swangan family estates back into shape, started her own garment factory, and built a prosperous life for herself entirely independent of her absent spouse.

When the long-running war finally ends, Byletta seizes the opportunity to reclaim her freedom. She writes a letter to her estranged husband requesting a divorce, only to have her plans upended when Lieutenant Colonel Arnald Swangan storms home with a counter-proposal. Rather than grant her request, he issues an outrageous wager: they will live together as husband and wife for a single month. If he can get her pregnant within that time, she must abandon her plans for divorce and remain married to him forever. If she does not conceive, he will grant her the divorce she desires.

The central conflict of the light novel revolves around this high-stakes arrangement, which forces two proud and independent people to finally confront the stranger they married. Byletta, who has a reputation as a villainess and a femme fatale, simply wants to continue her life as an entrepreneur free from the constraints of a noble marriage. Arnald, a man who has never known love and who married solely to advance his military career, sees his wife as a seductress who manipulated his family in his absence. Both characters operate under deep-seated misconceptions about the other, leading to a tense and awkward dynamic as they navigate their month-long "wager."

Set in the Gaihandar Empire, the narrative blends regency-era aesthetics with a strong-willed female lead who defies traditional gender roles. Notable narrative arcs include the initial clash of wills as Byletta and Arnald attempt to navigate their forced proximity, the gradual unraveling of the rumors and lies that have defined their perception of each other, and the development of a genuine, if reluctant, respect between the business-savvy viscount's daughter and the battle-hardened soldier. As the month progresses, the story explores whether a marriage born of convenience and obligation can evolve into something more, or if two people who have spent eight years apart are truly better off saying goodbye.