The Villainess and the Demon Knight Novel Volume 1 was written by Nekota with illustrations by Asahiko.

Being reincarnated as an otome game villainess is hard enough, but fate sure didn't hold back on stacking the odds against Cecelia. Her engagement is broken off, the heroine is harassing her, and she's forced to work in a brothel! To make matters worse, her first customer is none other than the heroine's childhood friend and debaucherous leader of the Imperial Guard, Duke Lucas Herbst. Terrified, Cecelia finds herself relentlessly pursued, only to wake up the next day in his mansion—marked as his fiancée?! Bound to this unhinged knight, the troubled villainess must endure his obsessive love. But is his intoxicating affection a curse…or is it a blessing in disguise?

The Villainess and the Demon Knight Novel Volume 2 was written by Nekota with illustrations by Asahiko.

Fate sure likes to keep Cecilia on her toes. After being reincarnated as a doomed villainess in an otome game, she was sent to work in the brothels only to be saved by Lucas, the captain of the knights and second-in-line to the throne. But duty calls when an ancient dragon appears and Lucas - the kingdom's hero and sole wielder of the legendary sword Eckesachs - is called to save their kingdom from calamity. To make matters worse, Cecilia learns that every hero who has faced an ancient dragon in the past has been slain! Nevertheless, Lucas departs for battle with a promise that they will wed upon his return. But does fate intend to send him to the altar…or the grave?