Once Upon a Demon's Heart by K. M. Moronova – Romantasy

Once Upon a Demon's Heart | Dark Fantasy Romance, Book 1

Dark fantasy romantasy: enemies-to-lovers, time loop, demon-demigod romance. Cruel Fates Duet Book 1 by K.M. Moronova. 18+, Like New.

PRODUCT DESCRIPTION

A Cursed Love That Could End a War

Once Upon a Demon's Heart is the first book in K. M. Moronova's Cruel Fates Duet, a dark fantasy romance filled with deadly curses, morally complex characters, and a marriage capable of changing two kingdoms.

Alira is a devoted demigod knight trapped inside a brutal time loop. Each cycle ends the same way: she is killed by the demon kingdom's feared Blood Knight. After enduring the same death twenty times, Alira knows something must change. Haunted by the attack she led against the innocent village of Thornhall, she makes a desperate choice intended to end the war between demigods and demons.

Destined Lovers and Mortal Enemies

Alira's plan brings an unthinkable revelation: she must marry the very knight who has killed her repeatedly. She is a daughter of Venus. He is a duke of demons. Their kingdoms are divided by war, but their love appears to be both cursed and destined. To save their people, they must confront their guilt, their growing desire, and the forces determined to keep them apart.

Romance Tropes and Themes

• Dark fantasy romance
• Enemies to lovers
• Arranged political marriage
• Deadly time loop
• Demigod and demon romance
• Forbidden and fated love
• Morally complex characters
• Warring kingdoms
• Guilt, redemption, and sacrifice
• Gods, knights, and dark magic

Perfect For
Adult romantasy readers · Fans of dark and emotionally intense romance · Readers who enjoy enemies-to-lovers stories · Fantasy readers drawn to demons and demigods · Fans of arranged-marriage romance · Readers who enjoy time-loop narratives · Collectors beginning the Cruel Fates Duet

Reader Advisory

This is an adult dark fantasy romance intended for readers 18 and older. The author advises that her books may contain mature or potentially triggering material, including violence, death, gore, mental-health themes, morally grey characters, and explicit sexual content. Reader discretion is advised.

Book Details

• Series: Cruel Fates Duet
• Series Position: Book 1
• Author: K. M. Moronova
• Publisher: K. M. Moronova
• Publication Date: July 28, 2025
• Format: Paperback
• Language: English
• Print Length: 358 pages
• Book Weight: 13.1 oz
• Dimensions: 5.25 × 0.9 × 8 inches
• Genres: Romantasy, Dark Fantasy Romance, Paranormal Romance
• Recommended Audience: Adults, 18+
• Condition: Used – Like New

Condition Statement

Used – Like New: This pre-owned paperback is in excellent condition with minimal signs of handling. The pages are clean and intact, and the binding remains secure. Please review the product images for the exact condition of the cover, spine, and edges.