Overpowered Villain Returnee in the Apocalypse - System is for Losers - Chapter 46: Gamble

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

Takumi Hirooka(20) works at a black company. He stopped at a convenience store before returning home, and then gave his beloved dog Leo a treat before eating his own dinner that he bought at the store.

After eating, Takumi stood up in order to take a bath, but due to exhaustion from overworking, he fell to the floor and lost consciousness.

When Takumi opened his eyes again, he was in an unfamiliar forest. But what he thought was a large wolf sitting next to him, was actually his dog Leo…

Leo was now big enough to carry people on her back, and could defeat monsters that appeared in the forest in an instant.

A woman they meet in the forest, Claire, tells them that Leo is the most powerful of monsters, a Silver Fenrir.

Takumi couldn’t help but think that this world was all a dream. But after speaking with Claire and witnessing Leo’s strength, he finally realizes that this was another world that he had come to.

They are invited to Claire’s great mansion, and Takumi eventually lives there.

The young man Takumi and the dog Leo who were somehow transferred to this world.

As the powerful Silver Fenrir, Leo will protect Takumi.

While Takumi discovers that he has a gift, it is an ability called Weed Cultivation.

…Could such an ability be useful?

Takumi was tired from so much work, but he uses his ability to live with Leo and Lady Claire. This is his story.

Reach the peak of immortal cultivation and become able to run amok without fear! Use the power of martial arts to rule the world and defeat heroes! The weather changes at the whim and wave of a palm. He who cultivates both immortal techniques and martial arts, who could possibly defeat him! Xiao Chen is a shut-in who purchased a ‘Compendium of Cultivation’. Soon after, he crossed over into the Tianwu World, a world ruled by martial arts. He then refined pills, drew talismans, practiced formations, crafted weapons and cultivated the Azure Dragon Martial Soul that had not been seen for thousands of years. This is a story that tells of an exciting and magnificent legend!