A/n: this is a Demon Slayer x One Piece crossover!
3rd Person's POV
(Y/N) Kamado is the older sister of both Tanjiro Kamado and Nezuko Kamado, in this world there are demons but (Y/N) doesn't want to deal with demons, instead she wants to go on an adventure in the sea so (Y/N) decided to leave home with her katana.
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She joined the Straw Hats pirates so she can travel around the sea, although she's a certified Demon Slayer, she quits being one when she joined the Straw Hats.
"Nee-chan!"she heard her two younger siblings calling out to her in her sleep, (Y/N) woke up. It was a year after the separation of the Straw Hats and (Y/N) was apparently in the Butterfly Mansion where all Demon Slayers are
"I'm certainly disappointed in you, (Y/N). You're a Water/Glass Hashira and you still went to live a life in the sea to become a Pirate"Kagaya Ubuyashiki said as (Y/N) looks at him
"...I'm sorry. It's really my dream to become one, I said I quit but both my younger brother and younger sister found me again...."she said as Kagaya looks at her
"You were found by Nezuko, luckily. I didn't know that you quit until I found your wanted poster, Demon Slayer (Y/N)"Kagaya said as he dropped a wanted poster to (Y/N)'s lap, it was her and the other Straw Hats.
"The people knew what your job is back then and now....we are responsible for you...I'm very disappointed but considering your still a Hashira...I can't let you be find out here"Kagaya said and (Y/N) looks at him
"Why? You can just hand me over to the Navy"she said as Kagaya smiled
"You're younger siblings can't let you, you know? Also all the Hashiras obligated to the idea of you handing to the Marines, we truly trust you"Kagaya said and (Y/N) looked at him then she noticed a lost wanted poster from the Straw Hats
"Cavendish....? A rookie along with us? Huh....he's handsome"(Y/N) said as Kagaya smiled then patted (Y/N)'s head
"Fate will bring you chaos in the future, (Y/N). Alas, we in the Demon Slayer Corporate are rooting for your dream"Kagaya said and (Y/N) nodded, she had been training alone, once she learned that there are two Haki's, she learned to have the two of them. The observation Haki and the Armament Haki. A year after spending training alone and spending her time with her siblings, she was ready to meet her teammates again. (Y/N) had been tracking Cavendish since she had a crush on him, he was popular and he was handsome.
"Nee-chan, you'll be leaving so take us with you!"Tanjiro said as (Y/N) smiled
"I can't take you both, you have to protect anyone in this corporate"(Y/N) said as Nezuko looks at her older sister and caressed her cheeks, all Hashiras appeared on the ship and they seemed determined to help (Y/N) back in Sabaody Archipelago. After the Fish-Man Island, they went to Dressrosa for defeating Doflamingo. (Y/N) was separated from the others because of the scent of a demon, mostly the scent of Muzan Kibutsuji
