Naruto: The Outsider's Resolve - Chapter 1.5 (015):

As a precocious child, Lycoris suffers from a strange sense of deja vu. On the day her father told her about her fiancé, she realizes that her fiancé was a character from an otome game she once played in a previous life.

As a promise, he went out into the world as an assassin. 3 years later, after becoming the Supreme Assassin, he gave up on everything he had and returned to the ranks of ordinary people. But one day, Kismet, a mystical game created by the National Research and Development had appeared.

Enigmatic hands, spectral frame, and one cunning strike just like the swing of the Grim Reaper. The Supreme Assassin takes on the mystical world, and how his legendary tales sets off, progressively ascending the altar to becoming the best.

- Description from Novelupdates

#Rated 18-Mature ThemesViolet’s life was never her own—her father’s crushing debt made sure of that. But when the debt collector kidnaps her as payment, she takes a desperate deal: become a servant and spy on the mysterious and tyrannical Lord Cain, the ruler of her Werewolf district.There’s just one catch: Lord Cain only permits male servants in his house.Disguised as a boy, Violet cuts her hair, flattens her chest, and dons a voice-altering band to pull off the deception. Everything goes according to plan—until Cain, a man known for his cold personality starts to take a peculiar interest in her.Violet’s disguise becomes a prison as she battles her own growing attraction to him. But this is no love story. Cain’s obsession to her is dangerous. Beneath his icy gaze lies a mind fractured by years of affliction by a curse.A curse made by Violet's biological mother: A powerful witch.*************“TAKE IT OFF!”Violet’s knees nearly buckled at the thunderous command, her chest tightening with panic. The raw anger in Cain’s voice was as sharp as a blade.“My lord! I-I’m a man!” she stammered, gripping her shirt tightly, her fingers trembling as they clung to the fabric.“I don't like other men!” she cried, a desperate plea in her voice since the second she took her shirt off and he discovered that she was a woman was the moment she died. Painfully.Cain’s glare was unyielding, his voice dropping into a growl. “Don’t insult me, You think I do. You kissed me!”Her breath hitched as he stepped closer, his presence suffocating. “If you don’t take it off,” he said, his tone low and dangerous, “I’ll rip it off myself.”Violet’s mind raced, panic threatening to overwhelm her. She couldn’t let him find out—he’d kill her. Painfully.Glancing away to avoid his gaze when she caught the undeniable bulge in his trousers. Heat flushed her face, her thoughts spinning in desperation at the only idea she could think of to make him back off.'This has to work. It has to!'

In the 21st century, she was the outstanding world renowned darling of the field of archeology. Then, she transmigrated and became Jinjiang city’s Ji Family’ Third Miss, a small malnourished girl who starved to death. She was unfavored by her father and treated like air by the rest. Therefore, just to earn money and feed herself she had to return to her old profession – being a forensic anthropologist.