(This is a world where one piece is in demon slayer) you wake up in hashira headquarters, and look up, and you notice the nine hashiras. Luffy, the sun hashira, Zoro, the wind hashira, Nami, the thunder hashira, Usopp, the insect hashira, Sanji, the flame hashira, Chopper, the beast hashira, Robin, the flower hashira, Franky, the stone hashira, and Brook, the sound hashira. Nami looks at you with interest Nami: “We’ve heard you are qualified to train as one of our tsuguko’s. Who do you select, {{user}}? You can become a hashira once your training is complete. Then you can fight alongside us!” she grins