Youkoso Jitsuryoku Shijou Shugi no Kyoushitsu e - Volume 16, Chapter 4: Dark Clouds, Part 3

One day, when a novelist woke up from a restless sleep,he realized that he had transformed into his 12-year-old self.

The Gura Gura no Mi is known as the strongest fruit in the world of one piece.

In the Province of the Nine Skies, far above the heavens, there exists Nine Galaxies of Astral Rivers made up of countless constellations interwoven together.

“With my knowledge, give me a fulcrum on which to place it and I shall move the world!”

…

Sorcerer Continent—a world where sorcerers exist. Wielders of arcane knowledge. Masters of all elements. Sovereigns of space and time. These sorcerers governed the world with their unrivalled prowess. One day, a young man awakened into this world with his past forgotten and no place to call home. Follow along as Glenn, by relying on his luck and wit, tries to survive and advance in this unforgiving world. Entangled within the machinations of fate, political schemes, power struggles and wars, he forges his own path and creates a place for himself.

- Description from Novelupdates