One Piece: Time Is Supreme, Space Is King, and I Am God

[Decisive and Ruthless] [Koby Must Die] [Momonosuke Must Die] [Harem] [Pick Any Devil Fruit] Xia Nan accidentally transmigrates to the world of One Piece, binds to a System, and obtains the strongest Super Logia Devil Fruit: the Time-Space Fruit. After learning that he is Garp's grandson, he agrees to join the Marines. Garp plays matchmaker for Xia Nan, setting him up with Boa Hancock, one of the Shichibukai, and Yamato, daughter of one of the Four Emperors, Kaido. With Nami and Nojiko by his side, he recruits Three-Sword Style swordsman Roronoa Zoro and Dracule Mihawk, the World's Greatest Swordsman. Smoker and Tashigi volunteer to follow Xia Nan to the Grand Line to gain experience. His crew can pick any Devil Fruit they like and eat whatever they want. Garp: “My grandson needs a lot of gold.” Sengoku: “All right. The Marines will provide it.” Xia Nan: “That's not enough.” Sengoku: “Fine. I'll ask the Five Elders for more.” Robin: “I want to follow Vice Admiral Xia Nan. I don't want to be left wandering anymore.” Yamato: “If we're brothers, come and stab me.” Kalifa: “Actually, I'm a World Government spy. But I don't want to be a spy anymore. I just want to follow Vice Admiral Xia Nan.” Reiju: “Thank you for sparing my younger brother. I'm willing to follow you, Master.” Sengoku: “Kid, are you planning to betray the Marines?” Xia Nan: “No. I'm not betraying the Marines. The entire Marines are joining me in betraying the World Government.” “Since the World Government refuses to behave like decent people, I'll overthrow it and let them live like beasts.” After the World Government is overthrown… Sengoku: “Kid, now that the world is at peace, what are you planning to do?”