Naruto System in One Piece - Chapter 511: The Art of Explosion

The one single goal in life of the Strongest Old Sage is to subjugate the Demon King. In an epic final battle, both of them met their mutual destruction at each other’s hands.

However, the Demon King was not completely destroyed!

In order to destroy the Demon King once and for all; post-death, the Old Sage trains in the World of Gods and reincarnates as the Apostle of the Gods, Will.

In the reincarnated future, the Old Sage had become a legend and his former disciples hold the supreme authority in the world. The disciples had created an organization to oppose the Demon King and an academy to nurture the new generation of Heroes.

Thus the Apostle of the Gods, Will (8 year old), enrols into that Academy of Heroes.

This is the story of a boy on a mission to save the world through epic battles while enjoying Academy life.

Someone once saw me at the end of the world and respectfully called me the serpent that coils around the world—Jörmungandr.Someone once gazed upon my form at the edge of the Underworld and called me an ancient serpent—Satan.I was also feared by the gods and was called the hundred-headed dragon—Typhon.I have had many names—the serpent of creation, the serpent of sacrifice, the serpent of ceremony, the serpent of the world...But I have wandered through the chaos and arrived at the wilderness. There is only one divine name—the Primordial Ancient Serpent, the origin of everything.

Going against the heavens, Tuoba Ye reincarnated. Body concealing Divine Root, hands holding Divine Talisman, possessing previous life’s experiences, from childhood, began cultivating the most difficult body refining method: Mythical Nine Transformations.

- Description from Novelupdates

Bai XiaoHu has been a nine-tailed fox since birth and is always proud of her nine big and fluffy tails. However, when she was going through ‘heaven’s test’, the judgmental lightning burned all nine of her tails, leaving her with an empty back.

Bai Xiaohu was shocked, devastated, and raged; she has no choice but to look all over the world trying to find a way to grow her tails back.

Then she suddenly recalled that she once encountered a poor little white kitten several hundred years back, and to help him become enlightened, she offered him fur from each of her nine tails, helping to cultivate him into a nine-tail cat. Since his tails came from hers, if he is willing to give her one tail, she can attach it back to herself!

Thus, she started looking for that nine-tailed cat everywhere, only to find out he isn’t a part of the heavenly court and instead reincarnated into a human and had gone through several lives in the mortal world. In addition, the moral world he is now in is raging evil energy, which will cause it to collapse soon.

As the leader of the No. 1 mercenary team in the ‘last days’, Lu Ye was always respected and feared by everyone up until a little girl joined his team.

The little girl looked quite delicate, but super empowered when beating the zombies. Lu Ye’s only problem is that she keeps staring at his butt.

Couldn’t bear it anymore, Lu Ye cornered the girl: “What are you looking at after all?”

But who would’ve expected the girl to suddenly burst into tears: “Where are your tails?”

- Description from Novelupdates