One Piece: The Uchiha Royal Clan of Mary Geoise!

Reincarnated as the nephew of Uchiha Mikoto, Uchiha Shain repeatedly tries and fails to escape Konohagakure, until he unexpectedly awakens the clan system.

But the beginner quest of the system is actually to lead the entire Uchiha clan to the world of One Piece for development?

After repeated threats and inducements, Uchiha Shain successfully leads the Uchiha clan to abandon Uchiha Itachi and run away to the world of One Piece.

"Ding, congratulations to the host, the beginner quest has been completed successfully, and the system has been activated. The starter gift has been sent."

Surrounded by the unfamiliar sea, a trace of ambition gradually appears in Uchiha Shain's eyes.

Many years later, when the Navy, pirates, and the Revolutionary Army were frantically fighting over the so-called One Piece, on the Red Line at Mary Geoise, countless people gazed upward at the innumerable ruins as pairs of crimson Mangekyo eyes looked down from above. Amid the gazes of the clansmen, Uchiha Shain sat on the throne symbolizing the king of the world and coldly declared:

"From now on, this world only needs one royal clan!"

That day, one Uchiha after another with scarlet Eternal Mangekyo Sharingan opened their Complete Body Susanoo, and giant swords hundreds of meters long cut down ship after ship.

Kingdoms fell, nobles vanished, and the old era's Navy either submitted or disappeared. Any ship daring to fly a pirate flag would be destroyed by flames and Susanoo blades.

When Uchiha Madara from the world of ninja stood alone before the Nine Tailed Beasts below, and when Uzumaki Naruto shouted about so-called bonds and the so-called Allied Forces, space tore open, and one after another Uchiha clansmen dressed in loose, high-collared robes of pale gray and near white appeared in the homeland they had once known.

Long time no see, everyone!