One Piece: Peerless Sword Immortal

Protagonist: Gol D. Allen

One Piece, Transmigration, System, Swordsmanship, Top-tier Haki, Feel-good Story, Multiple Female Leads

On an unknown island, a seven-colored pillar of light enveloped a child, descending from the sky into the center of the battle between Roger and Whitebeard. Ultimately, the child chose Roger as his father.

"Ace, my foolish little brother, let your big brother protect you!"

With the advantage of his system, Allen grew stronger step by step, ushering in the era of the Peerless Sword Immortal.

Empress, Robin, Gion, Yamato, Hiyori... choose one?

Only children make choices, I choose to have them all!

"The title of World's Strongest Swordsman?" I don't even want that title.

"Seven Warlords, Three Admirals, Five Elders?" All defeated by me.

Sengoku: "You come and go as you please, is Marine Headquarters your home?!"

Kaido: "My good son-in-law, please don't come anymore, you've emptied out all my family's assets!"

Momonosuke: "Lord Allen, I beg you. Just spare me!"

Years later, Allen established his own sect, becoming the most terrifying force in the world.

In the final battle, he attacked Pangu City to confront Imu.

Allen died? Impossible, absolutely impossible!

Space and Time merge, DRAGON SLAYER!