He won the world's only chance to transmigrate. He transmigrated into the Naruto world, but got killed before he could even open his eyes. Then, on a whim, he was sent to transmigrate into the One Piece world. His name is Vinsmoke D. Natsu. Sharing part of the Fairy Tail protagonist's name is pretty whimsical too. But that doesn't stop Natsu from living an exciting life. A Sharingan System? What the heck is that? Wait, you gave me the Rumble-Rumble Fruit? For real? Hold on, the handsome Black Leg Sanji is my little brother? What, if I want to level up, I have to save Fire Fist Ace during the Paramount War? Is that even possible?
You say the Sharingan System has no level cap and can even copy and steal Devil Fruits? Even the crappiest fruit can be upgraded, let alone my Rumble-Rumble Fruit? Now we're talking! With an invincible Logia fruit like this, I'm definitely saving Ace, and I'm definitely becoming the Pirate King! And Blackbeard, get ready!
This novel and its characters are entirely fictional. Any resemblance to real people or events is purely coincidental. Do not imitate.
**As for the author's samsara eye, it's better to have a sharingan eye if you don't have the samsara eye.