From the Start, I Became Fire Fist Ace's Big Brother

Allen transmigrates into the world of One Piece and, from the start, becomes the eldest son of Gol D. Roger, the Pirate King, and the biological older brother of Fire Fist Ace. The first reward from his System is the power of the Nine-Tails.

Sure enough, once Allen's identity is exposed, the entire Navy hunts him down.

But Allen first wreaks havoc in Impel Down, then takes on the Buster Call head-on. At last, the Summit War arrives, and he faces the Navy's Three Admirals. Just as the Admirals think they can finally eliminate this menace, they realize that even working together, the three of them might not be able to defeat Allen.

This novel and its characters are entirely fictional. Any resemblance to actual people or events is purely coincidental. Do not imitate.