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

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

Once Upon a Demon's Heart is a dark romantic fantasy (romantasy) novel by New York Times bestselling author K.M. Moronova, first published in late July 2025. It is the first book in the Cruel Fates Duet and combines elements of forced marriage, lethal time loops, and a gritty enemies-to-lovers dynamic.

The Setup & The Curse: Alira is a devoted demigod knight (a daughter of Venus) who is trapped in a brutal, agonizing curse: a localized time loop where the demon kingdom’s ruthless Blood Knight slays her every single time. She is also consumed by immense guilt over a past attack she led on an innocent village called Thornhall.

The Break: After dying at his hands twenty times, Alira has had enough. To finally break the cycle, stop the war, and protect what is left of her fragile kingdom, she volunteers for a peace treaty offered by the demons—which requires handing over a demigod bride.

The Arranged Marriage: Upon arriving, Alira is shocked to learn that her betrothed is none other than Kalel Lornhelm, the very Blood Knight who has brutally executed her over and over again. He is a "devourer" who survives on the gilded blood of demigods.

Language: English.

Genre: Romance.

Binding: সেলাই করা বাইন্ডিং

Quality: Premium Quality Books.

Printing: High Quality Printing.

Paper: Eye Friendly paper (Cream White)

Cover: Matt cover (Paperback).