Death March kara Hajimaru Isekai Kyusoukyoku (WN) - Volume 17 Chapter 48

After choking to death on a watermelon, Rong Jiahui thought that she would enter the netherworld and be reincarnated.

But when she opened her eyes, she discovered, to her very horror, that she had returned twelve years into the past…

Looking at the beautiful and awkward “little brother” that would be conferred the title of Marshal in the future for outstanding military service, she almost let out a snort of laughter.

She firmly decided to hug the thigh of this little brother, and climb to the top of her life!

The plan was beautiful, but it had just one problem.

Why had this little brother… suddenly turned into…

A little sister…

- Description from Novelupdates

In the age of interstellar exploration, three hundred years ago, Mage explorers from the yellow river planet took their first step towards outer space.

It was a joyous event for every mage on that planet, yet unfortunately, space is dominated by other races.

The Peak level Mage from the Yellow River Planet was the weakest power in existence among other outer space races. It's a cruel reality for everyone.

From then on, every mage from the Yellow River Planet began to increase their power level by consuming outer space resources.

Then they constantly researched, upgraded the power level system and tried to pave the way for the next generation of space explorers.

Now, our MC Vincent Carey's ambition is to be the next generation of space explorers.

How is he going to increase his strength and compete among other races to get resources?

How is the unknown little yellow river planet going to be known and feared by others?

Anyone who could construct a stable Spell Model could become a Wizard — that was the Wizards’ ultimate secret! Having been given a new life as the son of an aristocrat and armed with a super quantum computer from his past life, Spell Models came as easily as breathing to Merlin. With this overwhelmingly huge advantage, would Merlin become the greatest Grand Wizard of all time?

Unhindered in the Demon Domain, the king is solitary!

In the world where immortals and demons strive, a good natured fellow sought the Demon Dao in search of justice.

At the end of his journey, he had eventually become this generation’s Heavenly Demon Emperor.

Although I am not fond of slaughter, I do not dislike it!

Desiring to see the Demon World, this is how I strive, this is how I become the Peerless Demonic Lord!

- Description from Novelupdates