Naruto System in One Piece - Chapter 26

He died on the wedding of the girl he had a crush on, after a long and successful career. After convincing Yama to send him back to the world, he decides to fix the areas in which his life went wrong. Realizing the lack of love and romance in his past life, he sets out to conquer the hearts of various women.

After being set up and killed by her half-sister whom her ex-boyfriend had cheated with, Mu Siyin woke up one day to discover that not only was she alive, but she had traveled back in time to 2 years before her death.

Ethan was just an ordinary guy until he woke up in the world of his favorite novel, Gods’ Final Requiem.But this isn’t a story where the hero wins. It’s a tragedy where the protagonist falls, the world crumbles, and the Demi-Gods and Outer Gods consume everything.And now, Ethan is here weak, talentless, and completely insignificant. A nobody in a doomed world.Yet, when an Empire Academy Admission Letter lands in his hands bearing his name he realizes something is wrong.More than that, his status window hides two sealed abilities, something that never existed in the original story.This wasn’t supposed to happen.If the world is truly destined to fall… then maybe, just maybe, he can change it.But first, he has to survive

The planet was invaded by the Tates, and suffered from the devastation of the last ages. In the crisis of survival, some humans awakened powers, and they realised that those mutant beasts could cooperate with their own consciousness and increase their fighting power to two times more.

This kind of animal was called Warpet. Shu Xiaohui was somewhat different from others. When the Tates invaded, he became a hamster and silently felt the presense of another powerful person.

Chen Chengduo watched his companions slowly find their warpet, and wondered where his one was until one day he saw Shu Xiaohui with his mouth full of melon seeds in the corner of the wall…

Others were warpet, his was only just a pet right…

Hamster: You… You don’t look at my small size. I have lucky BUFF!

- Description from Novelupdates