Kill Me More Times, I'll Become Invincible - Chapter 14:

Setsuna Shū is a magical girl with temporal magic that allows her to go back to the past whenever she performs a certain action. She works as a magical girl, hunting monsters and helping people… or at least, that’s what she lets everyone believe. In truth, she made a contract with a demon so she could return to the past and rewrite the future.Her real reason for turning back time is to save her “sister.” As a child, she had no parents, relatives, or friends. When she was finally adopted, her sister became her entire world — and for her sake, Setsuna wouldn’t hesitate to sacrifice the world itself. She gave up her original gender, her past “existence,” and even parts of her freedom in a demonic contract, all for the sake of saving her sister and taking revenge on the monsters that hurt her.But… is that really all there is to it? Or is Setsuna, in the end, partially responsible for everything that happened?

She sold her body to save her mother’s life.She never expected the man she gave it to… would be her new boss. Or the father of her child.Isabella Howells had her future mapped out—until everything shattered in one day. Her mother was dying, her fiancé had stolen everything, and with nowhere left to turn, Isabella made a desperate decision that would haunt her forever.Five years later, she’s a single mother craving a fresh start in a quiet town. When she lands a dream job as executive assistant at StoneTech Solutions, it feels like fate is finally on her side—until she walks into her new boss’s office and comes face to face with Jake Stones, the man she thought she’d never see again.The one-night stand. The man who swore he couldn't have children but was somehow the father of her son, Timothy.Would she be able to do her job without thinking about the past? What happens when Jake Stones is bent on making Isabella his, unaware of his secret baby with her? Will she accept him?What happens when Jake's brother's schemes puts Timothy's life in danger and Isabella is forced to reveal the truth about Timothy's paternity?Will Jake accept this truth? Or will it break him and everything he'd ever come to know about Isabella Howells?Let's find out in this story of love, lies, betrayal, and a second chance that could cost everything.

Go back to 2000.

Lin Feng didn’t want to disturb the situation, he just wanted to protect the things he cherished.

However, there is no need to explain the open life.

Since it’s all over again, there’s no turning back when you open the bow!

- Description from novelbuddy

The world changed the day that cracks appeared in the sky– suddenly monsters named『Demonic Beasts』appeared and began to rampage, attacking people.

Meanwhile, girls called『Magical Girls』began to appear to counter the demonic beasts. As they defeated the demonic beasts, gradually people’s lives gained a semblance of composure.

–but when there is light, there is also darkness.

In the corner of an alleyway, a boy who had been attacked by a demonic beast was dying. His voice begging for help did not reach anyone and his body refused to move.

「Boy. Do you want to be saved?」

Looking into the boy’s face, a black cat began to speak to him.

The boy nodded firmly to the devilishly sweet invitation, in response the black cat mocked him.

「Is that so—then I’ll【Haunt (Save)】you」

—on that day, a『Magical Girl』was born in a place that no-one knew.

『She』never laments, no matter what the future may bring.