Are There Romance Subplots In 'Isekai Adventure Kingdom Building'?

They don’t know I’m a girl. They all look at me and see a boy. A prince. Their kind purchase humans like me—male or female—for their lustful desires. And, when they stormed into our kingdom to buy my sister, I intervened to protect her. I made them take me too. The plan was to escape with my sister whenever we found a chance. How was I to know our prison would be the most fortified place in their kingdom? I was supposed to be on the sidelines. The one they had no real use for. The one they never meant to buy. But then, the most important person in their savage land—their ruthless beast king—took an interest in the “pretty little prince.” How do we survive in this brutal kingdom, where everyone hates our kind and shows us no mercy? And how does someone, with a secret like mine, become a lust slave? . AUTHOR'S NOTE. This is a dark romance—dark, mature content. Highly rated 18+ Expect triggers, expect hardcore. If you're a seasoned reader of this genre, looking for something different, prepared to go in blindly not knowing what to expect at every turn, but eager to know more anyway, then dive in! . . . . Check out my new book, sequel and set in the Urekai Universe: Once His Bully, Now His Whore.    

Aurora, a strong-willed and compassionate princess, is next in line to inherit the throne of the mystical kingdom of Eldrador. However, her parents' sudden passing leaves her with a daunting task: choosing a suitable partner to rule alongside her. According to ancient tradition, the queen must select a group of four noble suitors each representing a different element (earth, water, spirit and the sword which slays), to form a sacred bond and ensure the kingdom's prosperity. Aurora is torn between her duty and her desire for true love. As she navigates the complexities of court politics and magic she finds herself drawn to each of the four suitors, each with their unique personalities and abilities. But she has a childhood crush that she cannot move on from, a shadow walker and highly ranked ninja, Kael StarSeekera who would appear later to defy all that she knows and believes.

～I was a good looking prince when I was reborn, and because I could do indecent things as much as I like, I decided to make a harem while travelling with a beautiful female elf~ Formerly a gamer, the hero who was just reincarnated became a handsome elf prince of another world. In his previous life, he was just a plain-faced man, so in this world, he uses his high position as a prince to his advantage and keeps holding beautiful women in his arms, every day in his life. With his status as a prince and handsome face, together with the high abilities of the elves……he will thoroughly enjoy life unlike in his previous world! Main Characters:- Alan vi Alling: The main character of the Novel. An otaku who died as the Virgin in his previous world but was reborn as the Elven Prince. Because of his previous life he set himself up and determines himself to taste every woman he came across. Now in this life he is the dirty playboy. Cecil Mir: An Elven Woman and Main character attendant also his childhood friend and harbour feelings for him, despite being him the playboy.

A new sparks ignites Alanna's boring life when she gets unceremoniously kidnapped and taken to the underworld where she meets Zeron, a demon who is the king of the ice witches. Alanna thinks she has heard it all until she discovers that the king has been terminally ill for centuries and is dangerously controlled by his darkness, as a result of a curse that had been placed on him as a child. Furthermore, Alanna finds out that she is the king's cure and in order for the king to be free from the curse, she has to bond with him in every way, including marriage. Having nothing to lose, she agrees to help the king. Soon, she's falling in love with him. But will her innocent love be enough to save him? Will her passion remain unrequited, or will she finally succeed in breaking the icy walls surrounding the demon king's cold heart?

Serra is a normal senior high school student who works really hard every night and weekend to pay off her parents' debts from loan sharks. But when she couldn't keep up with payments anymore, she decided to end her life. Surprisingly, she woke up in a different light-- in another world. What's more shocking was when she is addressed by one of the people as the demon king's bride.

The Demon King’s Bride The entire kingdom fears him. With white hair, piercing blue eyes, and a heart sealed by cruelty, King Edrion is known as the Demon King—a ruler who accepts betrothed brides… only to turn them into concubines and discard them without mercy. When a young noble lady is promised to the king, her fate seems sealed. But she refuses to give up her freedom—or the man she secretly loves: a guard from her own household. Desperate, they devise an unthinkable plan—to have a poor girl, identical to the noble, take her place as the royal bride. The girl agrees to assume a life that is not hers, believing she will become nothing more than another forgotten concubine in the shadow of the throne. What no one expected… is that the king would choose her. Now destined to become queen to the most feared man in the kingdom, trapped in a lie that could cost her life, she must survive the court, a forbidden desire, and a king who was never meant to look at her the way he does. Because the Demon King does not love. But when he chooses… he neither forgives nor lets go.