Author's Note: Hey everyone. I've had this idea in my head for awhile now, but only now I've decided to start writing it. Essentially it's a crossover between one of my favorite manga with one of my favorite video games. So without further ado, on with the fic!

The sun shone brightly upon the water as the Thousand Sunny, the ship of the Straw Hat Pirates, sailed onwards through the New World. The captain of the Straw Hat Pirates, Monkey D. Luffy, sat atop the lion-head mast of the ship, a fishing rod in hand, with a bored expression on his face.

"Aaahhh…" He yawned, adjusting his signature straw hat. "I'm bored." His stomach growled. "And hungry. Sanji, make me some food!" He called out to the upper deck.

The crew's cook took a puff of his cigarette. "I can't make anything until we catch us some fish. We're fresh out of meat." He said in an irked voice that implied he had already given this explanation many times to no avail.

Luffy groaned and shouted towards the side of the ship. "Usopp! Chopper! How're you two holding up!?"

Usopp, the long-nosed sniper, responded back with another sigh. "Not even a nibble!" He too gave sigh, for he felt hungry as well. "None of the bait we're using is working at all!"

"Usopp, didn't you tell me you once caught a four-hundred pound goldfish all by yourself?" Asked the half-human, half-reindeer Chopper gullibly.

"Well, of course…but that was during a raging thunderstorm, everyone else had left to take shelter, I was the only one brave enough to remain outside and pursue the beast…"

While Usopp continued his fibbing, Zoro, the Straw Hats' green-haired swordsman, struggled to meditate with the ongoing commotion and chatter. Just ignore it… he thought as he fought to remain calm. You've heard Usopp's stupid lies a million times and have endured it before…you can do this…

"YOHOHOHOHO!" Brooke, the skeleton musician of the crew, suddenly cried. "Everyone! I've just finished composing a brand new song for us to listen! Come gather round and listen to 'Ramblin' Bones'!" He began to play a loud melody on his guitar, further irritating Zoro.

Franky, the Sunny's cyborg shipwright manning the helm found the beat to be catchy and began dancing to it. "Ow! This song perfectly suits this week's me!" Zoro's veins began to become visible.

"Saaanji, I'm hungryyy!" Whined Luffy again.

"I told you, YOU HAVE TO CATCH SOMETHING FIRST!" Yelled Sanji back, having lost his own patience.

The amount of commotion on the ship had reached its peak level. Zoro was about to burst when the cabin door swung open. There stood Nami, the orange-haired navigator.

"Oh hey, Nami!" Said Luffy, waving to his crewmate and oblivious to the look of annoyance on her face. "You finish drawing up those new maps?"

Nami winced slightly. "Luffy," She said, trying to keep her voice at a calm level while walking towards her captain. "Mapmaking is a very difficult process and requires the utmost concentration…AND I CAN'T FREAKING DO IT WHEN YOU'RE ALL ACTING LIKE IDIOTS!" She screamed as she hit Luffy directly in the face. On most pirate crews this would be considered an act of mutiny, but on the Straw Hat crew such a sight was rather commonplace.

Nico Robin, the historian and archaeologist, who until this point had been quietly sitting in a chair and reading a book, finally decided to chime in. "Isn't it great when we can just relax like this?" She said happily. Compared to all the times the Straw Hats had spent gambling for both their freedom and their lives while going on highly dangerous adventures, Robin had a point. But, unbeknownst to the crew at the time, what might be their biggest adventure to date had just begun to take shape…

Meanwhile, far, far away in the Mushroom Kingdom, the sun shone equally bright upon a certain house. This house belonged to Mario, the hero of the Mushroom Kingdom, who had undergone his own fair share of adventures, most of them involving the protection of Princess Peach from the clutches of many of the kingdom's enemies, including his main rival, Bowser.

Parakarry, the winged parakoopa turtle, flew down in front of the mailbox in front of Mario's house. "Mail call!" He yelled before dropping off a thick envelope and flying away.

The door opened. Out walked Luigi, Mario's equally accomplished younger fraternal twin brother (Though I'm afraid he never gets quite the credit that Mario receives). He opened the mailbox and examined the envelope.

"Hey Mario!" He said as he walked back into the house. "It's a letter for you, bro! And it's from Princess Peach!"

Mario, dressed in his signature overalls over a red shirt with a matching red cap, was intrigued. "What-a is it, Luigi?" He asked in his trademark Italian accent.

"Here, let me read it to you!" Said Luigi, who began to clear his throat in preparation.

"No, it's-a fine, I can just read it myself…" Started Mario, but Luigi wasn't listening. He clearly wanted to relish every moment he had in this ordeal. Luigi began to read the letter:

Hello there, Mario! I am now on holiday, traveling in the Mushroom Kingdom. In

my travels, I came into possession of a mystical map...a treasure map,

actually. It was inside a box I got from an old merchant in a town called

Rogueport. But since it would be too difficult for me to try to go find the

treasure all by myself...I thought you could help me hunt for it! You will, of

course, won't you? I've included the map with this letter, so please bring it

with you when you come. I'll meet you at Rogueport. (That means you MUST

come!)

~Peach

"Well, what do you know? There's an old map in this envelope!" Finished Luigi as he produced an old, weathered map from the envelope and gave it to Mario. "What do you say bro, you up for it?"

Mario examined the map, careful not to damage it in its delicate state. While he could make out many different features and areas of the map, there were no distinct markings or X's that would imply any treasure to be found on it. But if Peach had said it was a treasure map, chances are it probably was. "Luigi, pack-a my bags!" He said. "I'm-a going to Rogueport!"

Meanwhile, back on the Thousand Sunny, things had quieted down a bit since the altercation between Luffy and Nami. They had not succeeded in catching any fish when Nami again emerged from her cabin.

"Finally done!" She said in a much happier tone as she stretched her arms. "So, have we caught any food yet?"

Sullen glances from everyone responded to this question, especially from Luffy, who looked like he was going to keel over from starvation. "Ah…I'm going to take that as a 'no' then?" Said Nami apologetically.

Luffy looked out again towards the sea again. "WHERE ARE THE FISHES?!" He finally exclaimed, standing up and raising his arms towards the sky to convey his anger.

"Certainly, it is strange how nothing seems to be in the water…" Said Robin. "Perhaps there's something in the water so dangerous that nothing is coming near us…"

"…I really hate it when you talk like that." Shuddered Usopp.

"Hmph, it's probably just because you three are no good at fishing…" Started Nami, but stopped suddenly. She had just gotten a very ominous feeling. One she had felt before. "Or maybe…there's a big storm coming."

"Hmmm? But there aren't any clouds in the sky…" Observed Zoro. "Then again, this is the New World we're talking here…"

"No, there's definitely a storm coming…I can feel it." Said Nami. She had the keen sense of being able to forecast weather based on the slightest change in wind or temperature. But she had a particularly bad feeling about this one. "Usopp! Chopper! Take down the sails! Franky, change direction to head fifty-five degrees southward!"

"Aye aye, Navigator!" Called Franky as Usopp and Chopper began hoisting up the sails. They knew better than to doubt the reliability of Nami.

Sure enough, within an hour of Nami's prediction, the sky began to darken with grey clouds, and rain began to fall, only slightly at first, but eventually evolved into a torrential downpour. The waters became rough and the ship began to rock back and forth.

"H-hang on everyone!" Called Franky from the helm, who despite his massive, metallic body could feel the effects of the wind. "Looks like we're in for a rough one!"

Suddenly Luffy noticed something. "What is that?" He asked in a surprisingly calm voice. He pointed to something not far off from where the ship was. The Straw Hats followed his arm and found themselves staring at the largest whirlpool any of them had ever seen.

"I-i-it's a whirlpool!" Cried out Usopp in panic. "If we fall into that, we're gonna be done for!"

"Quick, Franky! Turn the ship to the left!" Nami ordered. But it was too late. The ship had begun to be pulled into the whirlpool. The ship began to tilt slightly, and the Straw Hats soon found themselves losing their balance.

"It seems like we're heading towards sudden death." Robin said grimly.

"No way some stupid storm's going to take us out!" Said Luffy defiantly. "Franky! Use "Coup de Burst" to fly us out of here!"

"No good, Luffy!" Replied Franky. "At this angle, we'd only be going straight into the water!"

Zoro, meanwhile, had his eyes focused on something else. "Hey, doesn't the bottom of this whirlpool look a little…strange?"

Brooke looked down. "Yohoho! He's right! There's a hole at the bottom!" Instead of the water eventually meeting again at the bottom, there looked to be indeed a pitch-black hole, one that bore resemblance to the entrance of a tunnel.

"W-what is that?" Asked Chopper, now hanging on for dear life.

Suddenly the ship gave a huge jerk forward. "Looks like we're going to find out…" Muttered Sanji, as the ship tilted nearly sideways, causing the crew to fall of the ship and down towards the hole, causing everyone to scream loudly.

"AAAGGGHHHH!" They all yelled as they fell down into the hole, as well as into one of the greatest adventures of all time…

Author's Note: Well that was my first chapter. What did you guys all think? Please like and leave a review and tell me how I'm doing!