I Am in One Piece: Invincible with One Sword

Traveling through the world of One Piece, what should I do if I am an ordinary person, and in the era of Rocks, this is a real pirate, killing people without blinking an eye. Awakening the swordsmanship system and becoming the king of the pirate world, becoming an adventurer, let me gallop in this world of pirates... Become the number one swordsman. Pirate world, I am here to welcome your king! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.