Transmigrating to One Piece: I, Naruto, Will Rule the World

[Ridiculously satisfying + semi-invincible + pirates + killing Celestial Dragons + killing Momonosuke + killing Koby + Mamba + the GOAT + Naruto + absurdity...]

It all begins when Naruto is chosen by a System and accidentally transmigrates into the world of One Piece.

He thinks it's a normal transmigration, but it turns out the System is actually the GOAT in disguise, trying to take over Naruto's body and live again. Naruto has no idea.

The GOAT keeps his identity well hidden, giving Naruto pieces of his consciousness and energy as “rewards” at opportune moments. What Naruto doesn't know is that his System actually belonged to Black Mamba...

The GOAT works tirelessly to escape his fate. After a super-intense 2,400 hours of training in a single day, he beats to death the enemy who gave him athlete's foot on his head,

but he still can't avoid dying in a plane crash. Now, transformed into a neutrino and living again in the world of anime, what kind of legend will he write?

The early part may be a little slow, so please be patient, dear readers. It gets really exciting later on!