Naruto System in One Piece - Chapter 8

After reincarnating as Zhou Xuanji, the prince of an empire, he thought that he would be able to live a worry-free life of luxury. He did not expect to be involved in a rivalry with the Empress herself, who forced him to escape from the palace.

Su Wan is a Realm Destroyer. She shuttles to different time-spaces using the identity of the “Cannon Fodder Ex-Girlfriend”, dedicated to plotting how to happily tear apart the male protagonist and the female protagonist. –There’s no such thing as protagonists who can’t be torn apart, only Ex-Girlfriends who don’t work hard enough~

- Description from Novelupdates

Oh Kang-Woo suddenly fell into Hell one day. The only things he had were his desire to live and the Authority of Predation. He devoured hundreds of thousands of demons from the First Hell all the way to the Ninth Hell, and even made the seven princes of Hell bow down to him.

“Why are you trying to go back? You already have everything that you could possibly desire here in Hell.”

“I have everything? Like what?”

There was nothing to eat or enjoy! The only things in Hell were desolate lands and hideous demons!

“I’m going back.”

He finally goes back to Earth after ten grueling millennia.

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Ye Qiu transmigrated to a world of barren wastelands. He obtained the 10,000 Fold Return System.