Reborn and Counterattack: The CEO's Powerful Sweetheart - Chapter 420:

A boy from 21st century Earth, met an accident and later was reborn in Naruto’s Ninja World.
He is born in Uchiha Family and becomes the useless brother of Itachi Uchiha and Sasuke Uchiha…. Let’s see how he changed the Naruto world.

- Description from Novelupdates

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.

The handsome Emperor of the acting industry, Mo Zhen, has caused thousands of girls to fall in love with him in his 26 years, but has never fallen in love before.

That is until a certain shameless ghost shows up at his house and decides to move in with him to become a freeloader.

Not only does she blatantly try to follow him to the bath, plots revenge against any females with ulterior motives within five meter distances, but she even wrecks havoc online by providing secret info about him to his fans!

Honestly, how shameless can a ghost get?

Out of all the ghosts in the world, Emperor Mo still loves his little ghost wife the best.

And out of everyone in the entire world, the little ghost still likes to watch her family’s Zhen Zhen bathe the most.

- Description from Novelupdates

Due to an accident, she saved the empire's big shot, who insisted on marrying her as a token of gratitude.The crowd mocked: Can a country bumpkin like her be worthy of Young Master Knight?What? Rustic, ugly, and useless? She turns it around with a shocking beauty and countless hidden identities gradually revealed.Summer Monroe returned home with a hidden identity, only to uncover the truth behind her mother's death.As each of her identities was unveiled, the crowd was shocked to realize: the big shot's wife is the true big shot!