Naruto System in One Piece - Chapter 18

500 years ago, Chen Xi was devoured by a crack in the void and was transported into a cultivation world.

500 years later, he returned back to Earth after enduring through several hardships and discovered that only 5 years had gone by.

…

In the courtyard, beauty at the side, a candle flame wavering.

A gush of clear wind, half a full moon, the peach tree remains unchanging.

…

Wait, whose kid is this?! Why is she calling me papa? Gazing at the little girl in front of him with skin as pale as jade, Chen Xi froze.

…

　
Returning home from cultivation, starting as a stay-at-home dad.

In this life, not fighting to be a king nor claiming to be a tyrant, only praying to peacefully be a wife-pampering mad devil and a child-protecting daddy!

- Description from Novelupdates

What happens when, in the midst of struggling to keep up with life, you suddenly discover that you were a princess in a past life? Now, you're just a waitress with a drunken mother and a pile of bills to pay. But deep down, you know one thing: you’ll find the stupid jerk responsible for ending your royal life, no matter what it takes.Alexia POV:Then there are the spoiled, narcissistic rich jerks who think their daddy's car gives them a free pass to treat women like objects. Not today, Satan. These guys are like walking perfume ads with egos bigger than their bank accounts. I swear, they should just marry themselves—they're clearly their own type.When one of those jerks lands at my table, I can smell the entitlement from a mile away. I don't even wait for the inevitable sleazy pickup line or the “accidental” brush of their hand against mine. Nope. I pawn them off on one of the other waiters faster than you can say “unpaid rent.”

What the hell is this? What the hell happened here?

How did my room become so ruined after a single night?

The floor and table were covered in dust, his new poster of Zhang Liang Ying that had just been posted on the wall a few days ago had already become yellow and tattered all over. Even Zhang Liang Ying’s beautiful face became monstrous, as if an old devil was looking at him with a terrifying smile.

The walls were covered by a mist of cobwebs and the fruits placed on top of the coffee table were withered and rotted to the point that the mold on them had turned black. The fruits below even seemed to have turned into mush. The aluminium framed window that the landlord had just installed not that long ago was now covered in a layer of white ash and the glass was filled with cracks and covered in dust.

The computer beside his bed was also covered by cobwebs and was accompanied by an empty water glass with a withered worm inside of it.

Dust filled the air making Wei Xiao Bei choke as he tried to breathe.

Everything seemed to be ash gray without any light, as if looking at television static.

After just one night, it seemed like everything in the room had aged for centuries or even millennia.

Mother… is this a dream?

This must be a dream!

—

One day, Wei Xiao Bei gets dragged into The Dust World, a post-apocalyptic world ruled by monsters from myths, legends, games, etc. He also gains the power to travel between it and the real world, as well as the power called the ‘Status Panel’. With this power, he chooses to strengthen himself to explore the vast mysteries and terror of the other world. What mysteries await him? And what is The Dust World.

- Description from Novelupdates

As the son of the second generation Hokage Senju Tobirama, and Uchiha Izuna, Haru suddenly had countless complaints in his heart.

However, it seemed like there wasn’t much of a problem

Because Ninja World’s strongest connections had been born!

The first generation Hokage, who has the title of God Ninja World, is my uncle!

The super boss behind the scenes, Uchiha Madara, is my uncle!

Princess Tsunade, you have to call me uncle.

Alas, this damn seniority!

As for me, Senju-Uchiha Haru, I could have been a dandy in Konoha, but in the end, I was forced to unify Ninja World. What should I do?

Fortunately, there were golden fingers…