The National Art of Pirates

On the boundless sea, there is a group of people who yearn for freedom and run rampant in the sea in the name of their dreams. Four of them were called the Four Emperors. Later, an alien from the world came to dominate the world, and he was called the Emperor Wu. From then on, a new sea pattern was re-opened. (Okay, in fact, I was just talking nonsense in the end. It has not changed. After all, if it had changed, what would happen to One Piece?)