One Piece: From the Start, I Lay Low Until I Become Emperor, More Children, More Blessings

【One Piece + Levelheaded Protagonist + Multiple Heroines + Martial Arts + Swordsmanship + Devil Fruit Development】 Transmigrated into the world of One Piece at age five, with twenty years to go before Luffy sets sail... He keeps a low profile and builds his strength early on, then creates a force of his own later. A levelheaded protagonist who focuses on martial arts, swordsmanship, and developing his Devil Fruit powers.