Shinwa Densetsu no Eiyuu no Isekaitan - Volume 7, Chapter 5 – Despair That Crawls Out of the Darkness, Part 4

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.

Gu Fei, a rookie who has not survived three episodes in the apocalypse, traveled to ancient times with space and became a girl in the Hou Mansion.

As soon as I arrived, my house was ransacked and sold.

​​It was finally bought back by her family. After three years of severe drought in her hometown, there was no harvest. Gu Fei and her family fled the north.

Along the way, countless people died of hunger. Gu Fei: Don’t be afraid, there is food in our space.

Bandits and refugees were rampant on the way forward. Gu Fei: Don’t be afraid, we have weapons in our space.

After all the money was spent, Gu Fei led his family to farm and open an inn to make a fortune, and by the way, he gained a little overlord’s crown prince.

The innocent prince: My wife can always conjure up many strange things. My wife must be a little fairy.

- Description from novelbuddy

This is the first part, the second part is “Playing Fish Trapped in a Secret Room (密室困游鱼 Mi Shi Kun You Yu)”.

In 2007, at the WCG Asian Tournament in Singapore. In just a few hours time, between left and right hands, there goes a life and death battle. In the Chinese team that year, there is a professional player who’s only 15 years old, nicknamed “God’s Left Hand”. At that match, he sits right next to her.

Their professional lives start from 14 years old until they retire, disappear, at 25 years old.

In these non-mainstream tournaments, where a small niche of the population follows closely, their only possessions are a mouse, keyboard, and headphone each. There they won gold medals one after another for China.

She is a top-class spy, a poison specialist, but also a young and cute girl with a sinister temperament. In spite of her sweet and innocent appearance, she can complete any tasks without the slightest hesitation. One day because of an incomplete black magic, she was sent into the body of a girl who was deemed as a good-for-nothing. What kind of change will she bring to this continent?