What's It Like to Be Contracted to a Celestial Dragon?

Multiple female leads, plot-driven, fast-paced, schemes, calculating and ruthless. Kanuo transmigrates into the world of One Piece and, unfortunately, becomes a slave to the Celestial Dragons. Fortunately, he eats a Devil Fruit and gains the ability to grow stronger by making contracts with others. And so, Kanuo contracts with the Celestial Dragon Selindel, turning his life around. But there's a problem: the female stewardess knows Selindel well, and soon discovers his secret. So he has no choice but to contract with her too. With help from the Celestial Dragon Selindel, Kanuo grows rapidly, then uses her as an excuse to get the Marines Ain and Hina assigned to train with him. Knowing the story and their personalities inside out, Kanuo soon contracts with both of them. Later, even Stussy of CP0 and Gion, also known as Momousagi, fall into his hands. Now it's time to set his sights on the wider sea. Nami, Robin, the Empress, Uta: it's time to change the course of their lives.