Eliana, the eldest daughter of the Duke of Lumiere, has been training hard for years to be the best marriage candidate for Alvin, the crown prince of Threnvale, in the hopes of pleasing her father and bringing prestige and honor to the Lumiere family.
Her efforts finally pay off and she ends up getting engaged to the prince despite not having any feelings for him. Things go awry however, when Eliana's bratty little sister, Luna, demands that her hand in marriage should be given to the prince instead as she is the one who truly loves him. After Eliana rebuffs her demands, Luna ends up throwing a fit and refuses to get out of bed for days and won't eat or drink until she is given what she wants. The Duke of Lumiere gives in, believing that it doesn't really matter which of his daughters marries the prince as their social status isn't going to fall any further.
When Eliana hears that her engagement to the prince will be given to Luna instead, she runs into her room in despair. She then looks up at a a painting of a dragon and decides that she will sacrifice herself as a dragon bride to give her family prosperity in accordance to an old tradition which involves families sacrificing their daughters to a dragon that lives at the bottom of a volcano in order to be granted eternal prestige/harvest as well as a yearly stipend from the kingdom. But just when she jumps off a cliff into a pool of magma inside a volcano, a huge red dragon swoops in and swallows her. He quickly spits her out once he realizes that she is a human.
After Eliana comes to, she sees that there really was a dragon at the bottom of the volcano. The dragon then shifts into his human form and introduces himself as the "Avaricious Greed" of the seven dragon pillars and decides to humor the dragon bride custom of her culture by taking her in as his bride.
Imouto ni Fianse wo Yuzure to Iwaremashita, Saikyou no Ryuu ni Kiniirarete Masakano Okoku Nottori?(妹に婚約者を譲れと言われました 最強の竜に気に入られてまさかの王国乗っ取り) note is a fantasy romance web Light Novel and manga series written by Kashiwaten with illustrations by COMTA and hi8mugi.
- Arranged Marriage: Eliana is set to marry Prince Alvin at the beginning, though she later is replaced by her younger sister, Luna.
- Barbie Doll Anatomy: When nudity occurs in the manga, certain attributes are notably missing.
- Beast and Beauty: Greed, a fearsome dragon who is known to burn down anyone that get in his way, deeply cherishes the beautiful and kind Eliana, though he is very reluctant to admit it.
- Bullying a Dragon: Literally. Eliana, as the dragon bride and queen of the newly formed kingdom of Greed, was sent as an ambassador to negotiate with the kingdom of Threnvale. The first thing the authorities do is attack and critically injure her, then feign an audience to publicly ridicule and denounce her, and then sentence her to death. Greed is so astounded and angry at their stupidity that he immediately decides to take control of the kingdom.
- Character Development:
- Dragons Are Divine: Dragons are revered as godly creatures. The dragon's bride tradition is meant to appease the dragon for a bountiful harvest.
- Driven to Suicide: Since none of her family actually cares about her, after she offers to become the "dragon's bride" and jump into a volcano, Eliana at the beginning really has no reason left to live and wants to die.
- Finger-Suck Healing: Greed sucks on Eliana's finger in order to remove a splinter, much to her embarrassment.
- Flowers of Femininity: The meek and delicate Eliana has a blue rose in her hair.
- A Form You Are Comfortable With: Greed's true dragon form initially scares Eliana too much, so he transforms into a beautiful human to calm her down.
- Girlish Pigtails: Luna has her hair done in two pigtails. It's fitting considering how childish and irresponsible she is.
- Hyperspace Wardrobe: Jill magically dresses herself with her vines after Eliana asks her to wear clothes.
- I Just Want to Be Loved: All Eliana wished for was the love of her family. Being denied that, she tries to kill herself at the beginning. She vows to devote her life to her dragon husband after receiving affection for the first time from Greed.
- Interspecies Romance: Between the dragon Greed and the human Eliana. Greed decides on a whim to marry Eliana, but her incredibly kind, devoted and unprejudiced nature makes him fall for her for real.
- Long Title: The series has an extremely long title even by light novel standards.
- Morality Pet: Eliana brings out the best traits of Greed. Hurting her is a surefire way to get killed.
- The Needless: The horse familiars Greed creates with his magic do not need to eat or sleep and can't reproduce.
- No-Sell: After being drenched in Greed's saliva, Eliana has gotten a resistance to fire and heat, and she is not affected by Greed's poisonous scales.
- Parental Favoritism: For whatever reason, Eliana's younger sister, Luna, was always favored by their parents. She never had to undertake training like Eliana did, and after Luna throws a fit for not getting to marry the prince, her father eventually swaps fiancées.
- Proper Lady: Domestic, submissive, dutiful and graceful, Eliana is a kind soul, who only wishes to serve her family. However, the constant mistreatment and denial of any familial love eventually leads to her being Driven to Suicide. Eliana eventually Grew a Spine after meeting Greed and is now Silk Hiding Steel.
- Secret Test of Character: Becoming the dragon's bride is another fancy way to become a Human Sacrifice, the noble's family in turn would gain prestige for doing so. What Eliana wanted to find out is whether her family would love her enough to stop her from sacrificing herself. What she finds is her father only caring about still being able to make use of Eliana and at the same time gain even more reputation for his family.
- Third-Person Person: Luna keeps referring to herself by her name, a hint that she is extremely childish and self-centered.
- Voluntary Shapeshifting: Greed can at will transform into a humanoid body or adjust his size.
- Virgin in a White Dress: As the dragon's bride, Eliana initially is sacrificed in a white wedding dress.
- Wall Pin of Love: After it's been anonounced that the prince's hand in marriage would given to Luna instead of Eliana ,a random creep tells Eliana that he heard rumors about her losing her place as the Crown Prince's bride due to her infidelity. He then pins Eliana against a wall and tries proposition her into going out with him. Eliana manages to break free from his grasp by slapping him.
- You Gotta Have Blue Hair: Luna has pink hair, the dryads have green hair and Eliana has silver hair. Greed is portrayed with bright red hair.