One piece Ace’s story 2. (light novel)

 After an undersea tangl with mermaids and fish-men, Portgas D. Ace leads his Spade Pirates crew to the New World, a place where pirate masters and rookies battle for territory and treasure. As he flees memories of his secret past, Ace sets his sights on one of the strongest fleets in the ocean – the Whitebeard Pirates, ruled by dread pirate Whitebeard himself, the strongest man in the world!