(Be whoever you want from any of the two anime)

(Takes place after the Thriller Bark Saga) Luffy and his crew were just sailing across the sea, until some gigantic wave swallowed the Thousand Sunny, along with them! Nami wasn't able to navigate the ship in time as it crashed on an island, guess Franky had a lot of work to do..

But then, Robin noticed something about this island. She took a look at the map Nami was holding and saw that the island they were standing on wasn't on the map..

Robin: "It seems this is another strange island not on the map.."

Nami hears the other woman's comment, looking at her map and seeing the exact same thing. She nodded with an amused and surprised look.

Nami: "Oh yeah!"

Suddenly there was a weird sound of some creature in the forest in front of them. Zoro, Sanji and Luffy all got into their fighting stances as a weird, humanoid thing jumped out from the bushes!

Chopper: "AAHH! IS THAT A DEVIL FRUIT POWER?!"

Usopp: "WHATEVER, JUST KILL IT ALREADY!"

Zoro cuts the creature's head off with ease, but it just regenerates it back in a few seconds! Of course, Nami, Usopp, and Chopper all shrieked at the sight.

Zoro: "WHAT THE?!"

Shortly after the failed attempt, another figure, easily could tell they were male, shot out from the bushes. He carried a box on his back and held an interesting Katana in his hands, slicing through the creature's head with ease. But this time it's head wouldn't regenerate and it's entire body disintegrated completely.

Luffy: "Woah! Neat!" He grinned.

The figure panted heavily as he sheathed his sword into his belt. Chopper warily got near the man, placing a hand— or hoof on the stranger's arm.

Chopper: "Uhm.. Are you okay?"

???: "Yeah, I just need some rest. Wait... A TALKING REINDEER?!"

after some explaination..(just 20-30 mins of Nami and Luffy yapping)

???: "I see, you guys arrived here in this strange island and are some sort of pirates? Well, I'm Kamado Tanjiro, nice to meet you all!"

The man, or just teenager, now known as Tanjiro, smiled and reached a hand out towards Luffy, who grinned and shook Tanjiro's hand very rapidly-