One Piece: The Strongest Swordsman - Chapter 15: Journey Begins

Video games are one of the important ways to entertain people in the new era.

However, Take Yuxing from Japan, who traveled to a parallel world, found that the game industry in this world was extremely sluggish, and it seemed that it had never arisen.

So Zhu Yuxing decided to bring the ninth art to the world.

“Mom, Super Mario 3 is out! This is my most wanted Christmas present!”

…

“My Zelda is addicted to picking branches and has no intention to save the princess”

“It was Link who saved the princess!”

“Huh? Is it? Well Zelda”

…

“I am willing to sacrifice my soul just to protect the fire girl!”

…

“More than racing, Forza is YYDS!”

…

“Tifa is my eternal goddess!”

Games never sleep, this is a story that will only focus on developing the game entertainment industry.

(This story is a parallel universe and does not insinuate any related characters. Any similarity is purely coincidental)

- Description from novelbuddy

This is a story about Gong Lixin who was the young master of an ancient underground palace in the ancient times. He was raised by his master and forced to partake sexual relationships with numerous people to cultivate his Yin Body. His master who has a Yang Body was going to absorb him after he has reach a level to become stronger. MC refused and killed his master also dying at the same time. Then he transmigrated to the modern time and thinking he will enjoy peaceful life, the end of the world arrived.

Holo’s life was once a series of relentless hardships—bullies at school, abusive parents, and heartbreak at the hands of those he trusted. After a failed suicide attempt, a mysterious man offers him a deal: help rehabilitate four psychopathic girls, and in return, earn ten million dollars. Desperate and naive, Holo accepts, not realizing the chaos and danger awaiting him.Each girl comes with her own dark tendencies—Trixie, a violent and feral girl who acts on impulse; Scarlet, a master manipulator who delights in breaking people down; Felicia, a dangerously seductive woman battling a sex addiction; and Eleanor, a cold, calculating girl with a desire to watch the world burn. As Holo works to bring out their humanity, the girls become obsessively devoted to him, their love transforming into something darker.

Perhaps it is the choice of fate. As a senior otaku, Qian Lingfeng got the “steel shell system”. However, when he swept the world with the system, became a local rich man, made all kinds of beautiful women, opened a harem, and realized the ultimate fantasy of thousands of otaku, he found that things seemed far from simple!
When the end comes, biochemical zombies suddenly come down, fierce beasts are in power, bloodthirsty zerg roam to kill the world, and human lives are comparable to dirt. Where will weak human beings go in this world? Is humanity going to be extinct? Or … can an otaku save the fate of the human race?

- Description from Novelupdates