The Ultimate Power in the World of One Piece

(Also known as I Become Kamen Rider Kuuga in the World of One Piece. Kamen Rider Kuuga in One Piece. No System. One or no female leads "haven’t decided yet". The protagonist has a strong sense of justice and likes money, but has limits and isn’t saintly.) You were an ordinary person who transmigrated to the world of pirates, becoming an ordinary merchant on a small island in the East Blue. By chance, you found a strange belt among a shipment of goods, though it wasn’t listed on the manifest. Its familiar appearance piqued your curiosity, so you put it on. Then you discovered that the belt had merged with you. Only then did you realize that you had become Kamen Rider Kuuga, a champion of justice in this world!