One Piece: I have 300 Hero Legacies

In the year 1500 of the Sea Garden Calendar, when Ohara of the West Ocean was being baptized by the righteous artillery fire of the navy, Koshiro, the owner of the famous Kendo dojo, One Heart Dojo, adopted a baby in swaddling clothes.

He named her Xuan Yue.

Eighteen years later, Mystic Moon, who was standing on the sea, looked at Mary Joshua on the Red Earth Continent in the distance and muttered to herself,

"If I can’t split the world with a single sword, then what’s the use of my swordsmanship?”

"After all, her enemy is the entire world.”

Then, the blood-red ice blade in Xuan Yue’s right hand slashed down at the void…

The introduction is weak, please read the main text!