One Piece: Demon Hunter

Mr. XX traveled through time! He was reborn into a cowardly kid who only wanted to join the navy. He doesn't have a powerful system, and he doesn't have any golden fingers. However, he has the strongest master in the world, and that person is himself. He knows how Lei taught Luffy, and he knows how to better develop Devil Fruit. That's enough! Luffy has a good grandfather, an awesome father, an awesome second brother, and a ridiculously powerful background. But so what, he is his own background, and he relies on himself throughout the whole process. My fate is up to me! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.