Lucille, a well-meaning but unloved fiancée of the second prince, is publicly dumped in a scene ripped from the villainess handbook. In the aftermath of her humiliation, she loses consciousness, and upon waking, discovers she is living her ninth life. Her previous eight lives were spent not as a human, but as a cherished pet cat to some of historys most powerful figures, including a Japanese reincarnator who adored her smol kitty form. Now, as a human noble, she finds herself engaged to Felix, the so-called cursed marquess. A prophetic vision soon follows, revealing a dark future where she turns to forbidden magic, drives Felix away, and is ultimately executed by a Saint who is destined to arrive within the year.

Armed with the memories of her nine lives and the unshakeable confidence of a cat who cares nothing for the opinions of others, Lucille decides to unapologetically flip the script. She refuses to be a tragic victim or a scheming villainess. The second prince, her ex-fiancé, is a comedic buffoon who fails to recognize her without her heavy makeup, and Lucille has no time for his tantrums. Her primary challenge is navigating her engagement to the self-loathing and cursed Felix while dodging the many pitfalls her prophecy warns of. She befriends Alice Rohans, a young woman crushed by being the normal one in a family of geniuses, and contends with a father whose caring nature often manifests as coldness.

The narrative follows Lucille as she uses her past-life knowledge and a cats intuitive understanding of people to dismantle the tragedy before it begins. The plot is a deliberate and humorous mash-up of familiar tropes, from the villainess engagement to the prophecy of doom, yet it finds heart in Lucilles unique perspective. She doesnt worry about what anyone thinks, which makes her a perfect foil for the insecure and dramatic characters around her. As she grows closer to Felix, the story explores themes of love and self-acceptance, questioning what happens to people who understand love and those who have never truly received it. A key narrative arc involves Lucille working to break Felixs curse while also dealing with the foretold arrival of the Saint, who is meant to be her executioner. The first major story arc concludes on a cliffhanger, leaving the fate of the curse and the couples future unresolved, with the comedic yet heartfelt tone suggesting that this former cat has more than nine lives worth of tricks up her sleeve.