One Piece: Invincible Sword Domain

Travel to the world of pirates and become Sauron's eldest brother. If your younger brother wants to become the world's best swordsman, then your older brother will protect him! Karl has obtained a system called the Invincible Sword Domain. No sword attack can harm Karl. He will assemble a group of sailors who specialize in swordsmanship. After a few years, he will join the War on the Top in the name of Brother Sauron. Fujitora: I am willing to serve you! Hawkeye: I shouldn't have made that sword strike in the East China Sea! Redhead: Please give me some face! There was even a certain passerby, Wang Luffy, who expressed his jealousy online: Zoro, I didn't expect your background to be more terrifying than mine! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.