Aisatsu, also known as "Oppressive Waters Aisatsu", is a Pirate from the Grand Line, hailing from Fishman Island. She, with the rest of the Heikō Pirates are the Main Protagonists of Trials of the World. She worked under Yobidashi S. King in his crew as one of the four Heaven Waters, until the end of the Oshanyuyo Arc. They both joined the Heiko Pirates as their 11th and 12th members after dealing with the conflict in Oshanyuyo, and defeating another of King's Pirates' Heaven Waters, liberating the island from Yobidashi S. King's control.