Years after the death of the pirate king Gol D. Roger, pirates have set sail through the most dangerous ocean known as the Grand Line and find his greatest treasure the One Piece and become the next king of the pirates. Monkey D. Luffy, a boy from the East Blue who is made of rubber after eating the Devil Fruit known as Gum Gum Fruit, sets out from his home town to become the next pirate king and for the thrill of the adventure. Throughout his journey he gathers a crew consisting of Roronoa Zoro, Nami, Usopp, Sanji, Tony Tony Chopper, Nico Robin, Franky and Brook as they travel to many different lands and battles many other pirate groups and even the World Government and the marines.
Over on the girls side, Nami is getting her back scrubbed by Nefertari Vivi who tells her that she wonders that if there is a ship out there that has a big bath. When Nami looks over and sees all of the males Peeping over the wall, she gets up and covers herself with a towel and faces them and drops her towel on purpose in front of them saying "Happiness Punch" stunning all of the males giving them nose bleeds and causing them all to fall back down saying that she will be charging each and every one of them for the show she gave them. Nami and Vivi then get into the bathing pool together and while Nami is resting her arm on the side tells Vivi that they will be leaving tomorrow.
Back on the males side, all of the guys are sitting down outside of the bathing pool except for Zoro who is inside of it. Cobra then bows down to the Strawhats thanking them for saving his kingdom and claiming that even though he is a king those ranks don't exist in the bath.
During a brief montage in the Flashback of the childhood lives that Monkey D. Luffy, Portgas D. Ace and Sabo as adopted brothers, one of the moments was of all three of them in a Furo session at the bath at Curly Dandan's hideout. Ace was shown bathing in the Washtub while Sabo is seen laughing as he had a bucket put on Luffy's head.
Sabo is given an Off Screen Bath after he is brought back to his home. He was given the bath to disinfect him because he was living and associating himself with the commoners of the island that his father hated.
Volcanic Ash gets in Tony Tony Chopper's fur and Nico Robin tells him that they will take a Bath together later which chopper says that it isn't his bathing day but he will go anyway because the ash is disgusting. Brook asks if he can join as well and says that his face is disgusting as well but Robin says no while Chopper says that he doesn't mind.