The Game's Extra: Azhriel Odyssey - Chapter 45: Changed.

An ordinary high school boy named Max is in his basement watching porn and masturbating. When suddenly, a pop-up ad covered the whole screen!

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

Thousands of years ago, humankind left the Old World. We enter a new age where science and magic are no longer opposing concepts.

With these new opportunities came danger in the form of the Dark Races and the ones that named themselves Gods.

However, if there was one thing humans were good at was their ability to destroy. Humankind fought and carved a bloody path into the new world.

Cain’s luck had never been good, but his destiny changed forever once he decided to harden his heart and face the world without fear or hesitation.