Elf Tensei Kara no Cheat Kenkoku-ki - Chapter 9Book 5: -2: The Boundary that Protects One’s Humanity

“In order to survive the future great war, we must take drastic measures. We need to summon warriors and train them before time runs out.”Thus, millions of earthlings were reincarnated in an alien, medieval world governed by swords and magic to save its prophesied doom.Among those individuals, one's situation inexplicably deviated from the others.Thrust into a rotting house in a ghostly body, Adam found himself bound to a wailing baby. With a heavily damaged soul and the snarky remarks of a system, he began his years-long quest to recover his body.Armed with his mind, he'll educate the baby and slowly watch him turn into a good youth. However, he would have to make a choice: suffer as a ghost until he finds an alternative that might not exist, or possess his body and reincarnate.He was far from imagining how dangerous this world full of possibilities could be, prompting him to question everything he knew... Including himself and this world's intentionally blurred history.

In a romance novel called “The Secret Lovers of the Academy” the male lead would often torment his fiancée–but wait, why did she cross into this world to become his fiancée, the villainess, instead of the heroine?

The king of assassins was reborn, mastering both alchemy and poison. Sitting inside the space, there was a ghost that loved crying.

Buying a sickly boy for a hundred gold coins, becoming the master of half a country for no reason.

On their wedding night. She slightly hooked her jade finger, “Come here.”

The man tried weakly bargaining, “Can I redeem myself?”

“No!”

“Can we wait for the bridal chamber tomorrow?”

She cast a cold gaze, “Give me a reason.”

“I…..My period is here.”

Her head was covered in black lines, “Do you think you would even believe that!”

After four hours——

She weakly said, “I can’t go on anymore, wait until tomorrow.”

The man revealed an evil charming smile and turned her over before pressing down, “Want to run? Too late!”

- Description from Novelupdates

The Synders and Thornes had always been the closest of friends. So when Kyra Thorne and James Synders both lost their parents in an accident, twenty-year-old James swore to protect ten-year-old Kyra as though he were her uncle.Twelve years later, Kyra had not only blossomed into a beautiful woman, but she also could no longer ignore the feelings she’d developed for James at nineteen. After three years of struggling to suppress them, she was finally ready to confess.However, what Kyra didn’t know was that James had long discovered her feelings—and had devised the cruelest way to reject her.But, what happened when James unintentionally crossed a line?One thing was certain: Kyra Thorne always got even, even if it meant destroying them both.