One Piece: King of the Underworld, Summoned by the Five Elders from the Start

[No System + Devil Fruit Development + Supreme Swordsmanship + Martial Arts + Daily Life + Marine Harem] The good news: Allen has transmigrated into the world of One Piece, the place he knows best, and it seems he even has a powerful dad. The bad news: He was born with a hidden ailment, and each time it flares up, it lasts only a few seconds. Having transmigrated, Allen knows it's best to enjoy life while he can. Allen: “My body may be weak, but that doesn't mean my mind is lagging behind.” Clock out, go home to a warm bed, and every now and then make a guest appearance as a diamond member at a foot massage parlor. This is a world where nobles indulge while commoners suffer. But, sorry, I'm a noble. Kozuki Toki: “Darling, I'll take care of everything at home.” Gion: “I can handle Marine matters for you.” Boa Hancock: “I am willing to do anything for you, Young Master Allen.” … Every now and then, things get passionate, too. He builds a network underground, wins over the Marines, and spreads his information network across the whole world. Allen: “I do all this just to make sure I'm safe.” But when he looks back, he finds himself King of the World, with even Imu having to watch their step around him. When the cause of his hidden ailment is revealed, one event after another from his past begins to surface. Only then does he realize that nothing was ever that simple!