Aisuru Koushaku-sama, Tsutsushin de Korosasete Itadakimasu!

Estella awakens to find herself reborn inside her favorite Otome Game… But not as the heroine. No. She’s in the body of the doomed duke’s fiancée, moments away from her death ending! She knows what comes next: The Notorious Assassin, Rovelt, is on his way to end her life. And her only way to survive is clear: "Kill him before he kills her!" With cold resolve, Estella confronts Rovelt head-on. But instead of ending her, he smirks and declares: “Interesting… I’ve never met a woman like you before.” In a shocking twist, she isn’t slain at all. She’s claimed as his fiancée! What began as an act of self-preservation spirals into an outrageous dance of blades, hearts, and deadly attraction. Their clash of murderous intent slowly warps into something far more dangerous... True love!? A twisted, thrilling rom-com of assassins and affection begins!

Original Webtoon:
dbook, LINE Manga, eBookJapan