One Piece: The God of Humanity Descends

[It gets incredibly satisfying later] [Becomes a superhuman in just three chapters] [Overthrows the World Government]

After transmigrating into the world of One Piece, he eats the Superhuman Fruit and uses his incredible strength to shatter eight hundred years of old order with a single punch, smash through the Red Line, and bring the four seas together, giving the world its freedom.

Thus, the All Blue is born.

Twenty years later, a boy wearing a straw hat sets sail. The first legend he hears is: “The man who shattered the world gave us true freedom.”