Undercover Yonko, I Ended up Becoming the Pirate King

After traveling to the world of pirates, Rowan was trained by Kizaru to become the captain of the Blade Force. But the Blade Force is completely an empty shell and needs to recruit members by itself? Fortunately, Rowan has an equipment synthesis system and plans to continue to become stronger during his incubation period. "If Germa's battle suit is combined with a devil fruit, can he transform into a Kamen Rider?" "This is the correct way to use Devil Fruit!" Explore the combination of devil fruits and reach the top of the world. When Rowan turned around, he realized that he was surrounded by countless people and reached the top.