One Piece: My Devil Fruit Is the Great Sage Equal to Heaven

Twenty-first-century office worker Chen Sheng accidentally knocks over his water while watching Journey to the West. The water spills onto a power cord, and he is electrocuted to death.

When he wakes up, he finds himself in a strange world, holding a "Ginseng Fruit" in his hand.

Overjoyed, Chen Sheng eats the "Ginseng Fruit" on the spot. To his surprise, it turns out to be a Devil Fruit: the Mythical Zoan, Monkey-Monkey Fruit, model Great Sage Equal to Heaven.

He then gains several powerful abilities in his mind, including an indestructible body, the Seventy-Two Transformations, the Somersault Cloud, and the ability to grow to the size of Heaven and Earth...

Only then does Chen Sheng realize he has transmigrated into the world of Pirate King.

To get enough to eat, Chen Sheng joins the Marines.

But he still can't let go of the many regrets he had in his previous life, so he sets out to make up for them.

After finding the main crew, he follows them on their journey, just as Garp once pursued Roger.