The story begins with Martha, a woman who has been engaged to Cassian, the fourth son of the Blaze Count family, a lineage of knights. Martha, who possesses memories of her past life as a sickly girl named Masako, realizes that her current world is the setting of a shojo manga she loved, "The Moonflower's Embrace." Despite Cassian's passionate courtship and a proposal involving a ring with a rare "Moonflower" gem, Martha knows she is not his destined love. The manga's true heroine is Fiore, a baron's daughter, and Cassian's destined partner. Martha had hoped their fate might change, but Cassian confesses he has met his true destined person, deeply wounding Martha.
Martha's past life as Masako, a devoted reader of "The Moonflower's Embrace," instilled in her a deep knowledge of this world. She recognized landmarks and traditions, and even Cassian's family and his reputation for swordsmanship and good looks. She eagerly awaited the manga's beginning, which starts with a tragic theater fire. In the manga, Fiore gets separated from her family during the fire and is rescued by Cassian, who was coincidentally passing by. This encounter ignites their fated love. Cassian, too, was captivated by Fiore's kindness in asking him to save an elderly couple before herself. Their paths repeatedly cross, leading to a passionate reunion and engagement. Martha vividly remembers the iconic proposal scene where Cassian gives Fiore a Moonflower ring under a crescent moon.
This memory now torments Martha, as Cassian's proposal to her mirrored this scene, leading her to mistakenly believe she was his destined love. She knows her existence is not in the manga, and she and Cassian should never have met. Cassian, however, believes Martha is his destined person due to her actions during the theater fire. When the fire begins, Martha, despite knowing the story, intervenes. She rushes into the burning theater to warn people, saving many lives, including Fiore's. This act of bravery, however, alters the original story. Cassian, mistaking Martha's plea to save others as her own selfless nature, falls for her. He showers her with love letters and gifts, but Martha, knowing she is not the heroine, tries to reject him, fearing the inevitable heartbreak.
Cassian, determined to marry Martha, proposes again. Martha, still clinging to the hope that their fate might have changed, accepts. However, Cassian soon reveals his true feelings: he no longer loves Martha but values her as a friend. He plans to annul their engagement and attend an upcoming ball with Martha to avoid scandal, while also asking her to accept Fiore. Martha, realizing Cassian's manipulation and the social repercussions, coldly accepts the annulment, demanding compensation in the form of the abandoned Fataruna mine, which she knows holds valuable Moonflower gems.
Martha begins mining the Fataruna mine, and the rare Moonflowers are discovered. She establishes the Martha Trading Company to sell them, partnering with the Pietra Trading Company, managed by the disguised Third Prince Ashleigh, and later advised by the future Knight Commander, Darryl. Martha uses her knowledge of the manga to her advantage, manipulating situations and her reputation to her benefit, while also contributing to charity with her newfound wealth. She navigates social events, subtly outmaneuvering rivals like Glenda, Cassian's cousin, and even Cassian and Fiore themselves.
The story culminates with Martha becoming the future Queen, married to Ashleigh, who has ascended to the throne through a series of events influenced by Martha's actions. She is now revered as the "Moonflower Goddess," her past as the "Brave Goddess" during the theater fire contributing to her saintly image. While Martha initially feared her actions had irrevocably altered the world's fate, she finds herself in a position of power and influence, having shaped the destinies of many, including Cassian, who never became a vice-commander, and Darryl, who rose to become Knight Commander. Martha, though no longer the naive fan of "The Moonflower's Embrace," has found her own path to happiness and influence in this world she once only read about.
