Disclaimer: I do not own Naruto or One Piece. They belong to their own specific authors, Masashi Kishimoto and Eiichiro Oda.
Near the Shabaody Archipelago, the Strawhat pirates were in high spirits. The weather was peaceful and the crew had recovered from the injuries that the inhabitants of Thriller Bark had given them. With a new crewmate, "Humming" Brook, they had set sail to reach the midpoint of the Grand Line. Luffy, sitting in his usual spot, the lion's head, a flyer had fallen on his head. Luffy calls for his crew to come look at the flyer.
"Everyone come look" screams an energetic Luffy.
Unenergetically, the rest of the crew gathers near Luffy.
"Luffy, you better have a good reason for calling me. I'm busy making a cake for Nami-swan and Robin-chwan" said the cook Sanji.
Luffy shows them the flyer that he had mysteriously picked up. He reads aloud.
"Congratulations! You have been invited to participate in the 51st Dark Duel Tournament. The tournament is only for the best of the best. You and 5 others will fight other groups that have also participated. Keep fighting and winning against other groups and you will have chance to become the strongest fighter in the world. To participate in this tournament, the captain of the group must sign his or her name on the line below. We will take care of transportation."
"HELL NO!" says the ship's navigator, Nami. "We already fought with not 1 but 2 Shichibukai and Oars back at Thriller Bark. Do you want more fights?"
"I agree with Nami" says the ship's marksman, Usopp. "We had enough fights for a while. Let's just travel peacefully to Shabaody".
Robin reads the remainder of the flyer. "In addition to the title, the world's strongest fighter, the winner will also receive 1 billion beri".
Nami's eyes, changing into beri quickly says, "Hurry up and sign the form Luffy. We have no time to lose".
"It's decided" says Luffy as he signs on the line.
When Luffy finished signing, the clouds turn dark and a dark portal opens from the sky, slowly sucking in the Thousand Sunny. Before anyone can remark, the ship falls back down and to the crew's surprise, they see an island before their eyes.
"What a weird way of travel" laughs Luffy.
The crew starts to disembark, but Sanji suddenly notices that they were missing a person.
"Where's that idiot marimo (moss ball) swordsman?"
Unsurprised, they see Zoro still sleeping onboard the Thousand Sunny. Sanji yells at him to wake up. A very pissed Zoro reluctantly disembarks with the crew on this mysterious island.
I plan on writing more and thinking of ways to add to the story when I'm in school. Criticism is appreciated as I want this story to be good. I haven't written much crossovers or anything at all for quite a while so criticism is much more appreciated.