"Following the Boat", "No Babysitter", "Growing Up"
Disclaimer: The protagonist does not know the plot and is not a time traveler
He's the biggest scourge of Shieldstown, he doesn't care about anything, because caring means there's something to lose
Until the fool in the straw hat stretched out his hand: "You are also a person cursed by the sea, be my partner."
From being alone to having a partner with whom he could risk his life, from being a scourge to watching indifferently to being the sharpest dark blade of the Straw Hats, when his partner fell, he summoned darkness as his sword - this sword was not to become stronger, but to allow the Straw Hat to reach Rafdru safely.
The first five-star must be myself