My Girlfriend is an S-Class Adventurer - Chapter 282 Stones Over An Immaterial Lake

The world that nurtured the civilization which reached the pinnacle of magic was on the verge of destruction.
The last survivor transmigrated to the past, when the magic civilization started growing, as countless mages were still fumbling their ways through the thorny paths of magic knowledge.
He, who came from the end of the magic era, aim to reach the pinnacle of magic.

- Description from Novelupdates

After dying in the apocalypse, Su Jin was given a second chance as she was reborn into her former self just one month before the beginning of the end. Knowing that the world was about to fall apart, she started stockpiling everything she could. Her family started to think that she had gone crazy after her marriage and was ready to gang up to ruin the trashy husband. However, as the world suddenly changed around them, their air tickets and money were rendered useless and they now understood just how much foresight their beloved Su Jin had this whole time. As they continued to fight for survival, Su Jin’s husband scoured the city with several better-looking team members. One of them groaned while trudging ahead, This is the 212th time we’ve lost our way since the team leader began his search for his wife…

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