Global Reincarnation: Only I Know the Plot - Chapter 944:

A silhouette of a man standing upon a boulder with the crescent of the moon shining behind him.

A kukri dripping with blood in one hand and a pistol in the other.

The image of burning flames surrounding him.

The countless mercenaries screamed as they saw this scene.

“It’s a demon!”

Luo Wencheng made a deal with a certain existence and went back in time to ten years ago, when he had just been released from prison, still young and healthy, not yet pushed to the breaking point by Luo Wenjun and not yet used by him as a prop to test drugs for profit until his tragic death.

This time he was going to trample Luo Wenjun underfoot.

The first priority was to steal Luo Wenjun’s future backer from him.

- Description from Novelupdates

Crossing into the anime world and have a rescue system that will pop out a quest suddenly.

Can I get items and abilities after completion?

Do I have to travel to another world?

But before that Yuuki needs to save the world of otaku? Even though he is a Yakuza?

Everything start from here.

(This synopsis looked like the one from my Hitotose Note).

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Only update, when I have nothing to do

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Cover not mine, it's from anime Hajime no Gal

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Grammar sometimes sucks but bear with it.

https://discord.gg/Q3MFzds

If you want to tell me there is a grammar mistake.

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https://www.patreon.com/akikan40

Maybe I'll full of energy to write your favorite fanfic.

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