A/N: Hey readers! DemiNintendoSun here. This is my first Kingdom Hearts fic. A few warnings for you. 1. Spoilers for those who don't know about Birth By Sleep. 2. Bad descriptions cause I suck. That's all. Here are the ages for the characters of this chapter (I'll introduce the ages of new characters as they come in):

Sora and Kairi: 17

Riku: 18

Mickey: Infinite for he will never die

Disclaimer: I don't own Kingdom Hearts. Enjoy.

Chapter 1: A Letter And A Story

One day, a bottle with paper inside was floating in the ocean towards an island. The island is known as Destiny Islands, where three kids hung out. They were Sora, Riku and Kairi.

Sora is a boy who has brown, gravity-defying, spiky hair and blue eyes. He wore a black shirt with a black jacket over it, black over-inflated shorts, and big, black shoes. He also wields the Kingdom Key Keyblade.

Riku is another boy, but has long, silver hair and blue eyes. He wears a zipped-up black jacket with a white vest over it, blue jeans and sneakers. He wields the Way to The Dawn Keyblade.

Kairi is the only girl of the group. She has below-neck length, red hair and violet-blue eyes. She wears a white shirt with a pink, zipped-up mini-dress over it, and violet sneakers. She wields the Destiny's Embrace Keyblade.

Sora was sitting on a fallen tree, thinking of his past adventures and all the new friends that he made. Footsteps was then heard approaching. He turned and saw Riku. "Hey, Riku."

"Hey, Sora." Riku walked toward the tree and leaned against it. A silence followed after.

Later, a voice yelled, "Sora! Riku!" Said names turned and saw Kairi running toward them, waving a bottle. "We've got a message!"

She then gave Sora the bottle. He opened the bottle and pulled out the letter. Seeing the royal emblem on it, he said, "It's from the King."

"Then read it already."

"Okay, calm down, Riku." Sora opened the letter and read:

Dear Sora, Riku and Kairi,

I need your assistance to help some friends of mine. Come to the Doorway to Darkness. I'll be there. I need to tell you something before we can help.

Sincerely,

Mickey Mouse, The King

"I guess we have another adventure," said Sora. The other two nodded. "Let's go!" He jumped off the tree and ran towards the gummi ship with Kairi and Riku following.

Once they were ready, they launched to their next destination: The Doorway to Darkness.

Meanwhile, Mickey was pacing in front of the Doorway. He wore the same outfit in KHII. 'I hope Master Yen Sid is right. If he is, then we can save Ven. But we need to find Aqua first. Only she knows where he is. Also, Sora, Kairi, and Riku need to know everything before we begin,' he frantically thought.

As he was thinking, he also heard footsteps. He looked up and saw the trio running towards him.

"Sora, Kairi, Riku, you came!", said a happy mouse king. He hugged each one of them.

"What do you need?", asked Sora. He was then hit by Kairi.

"That's rude, Sora," she scolded. "We're here, Your Majesty," she said to the King.

Mickey chuckled at the two. "We're here," he said, "to help two old friends. One is lost in the darkness and only she knows where the other is. But before we can do that, I must tell a story to make sense of how this all transpired to you.

"Yay! Story time!" clapped Sora as he sat down waiting. Riku shook his head and sat on Sora's left while Kairi giggled and sat on the right side of Sora.

"Okay," said Mickey as he prepared himself. He opened his mouth and began to tell his tale:

"There was a time where there used to be Keyblade Masters and Keyblade Apprentices. The Masters were Master Eraqus, Master Yen Sid...

"Yen Sid was a master?" blurted out Sora. He was then hit by Kairi and Riku. "Owie," he moaned.

"Don't interrupt," Kairi scolded.

"Yes. I was his Apprentice," said the King. Sora and Riku were now shocked at the news. 'Damn!' they thought.

... and Xehanort...

"What?" screamed the trio. "Xehanort was a Master," said Sora in disbelief. Mickey nodded. The trio remembered how evil Xehanort was so it took a while to calm down.

... Master Eraqus had three apprentices: Terra, Ventus, and Aqua. I was Master Yen Sid's. Xehanort had none, but had an ally by the name of Vanitas...

"What did they look like?", asked Kairi. "Terra, Ventus and Aqua, I mean," she added. She was then poked in the side. She squeaked and glared at Sora.

"No interrupting, Kar," repeated Sora. Kairi blushed at her words being repeated to her.

"Kids," said Riku, causing the two to glare at him.

"Anyways," said Mickey. He thought for a bit and nodded.

"Terra is the strongest of the three. You guys have actually seen his face before."

"Really?"

"Yeah. Your Xehanort and Xemnas had Terra's looks."

"That was Terra?" asked Kairi.

"Yup. Master Yen Sid said he was forcefully fused with the old Xehanort. Terra, though, had brown hair and eyes instead of white hair and yellow eyes."

"So," began Sora. He thought of when he defeated both Xehanort's Heartless: Ansem and his Nobody: Xemnas.

"Yes," said Mickey as if reading his thoughts. "Terra is gone."

There was a silence as they mourned.

After a few minutes, Mickey announced, "Aqua's turn." Everyone perked up at the name.

"Is she the one trapped in the Darkness?" asked Riku. The King nodded.

"Aqua is the smartest, most adept in magic and only female of the three. She has light blue hair and eyes. She wears a dark blue shorts and shirt with pink belts intersecting on her front and back. She has elbow-length white gloves, two strips of blue cloth hanging from her hip, and a long, white cloth tied around her waist."

"She sounds pretty," whispered Sora. Kairi became angry at this, and Riku chuckled at her frustration.

"Ventus," started Mickey, "looks exactly like Sora's Nobody, Roxas."

"My Nobody looks like someone else?" said Sora increduously. Riku was shocked, but Kairi was confused.

"Who's Roxas?" she asked.

"Roxas is Sora's Nobody, like Namine is yours, and is part of Organizaton XIII," answered Riku. "He also managed to beat me once and uses two Keyblades: Oblivion and Oathkeeper."

"He beat you?" asked Sora. Riku nodded. "What is form called to summon his Keyblades?"

Riku shook his head. "He has no form. He just summons them."

"Really? But I have to go to Final Form to do that!" complained Sora.

"Guess he's stronger than you." Sora just pouted.

"Guys, can I begin?" asked Mickey.

"Sorry, Your Majesty," the two boys apologized.

Mickey nodded. "Ventus is the fastest and youngest of the three. The unique thing is that he wields his Keyblade backwards. He is like Sora; kind, friendly, compassionate, fun, but I think he's smarter, though."

Riku and Mickey then bursted out laughing while Sora pouted and Kairi smiled. "Sounds like my kind of guy," she said, inwardly smirking. This caused the two laughing to start to cry and gasp for air from how much harder they laughed. Sora, though, got instantly angry.

"I have those too, Kairi," he declared.

She nodded. "True, but he's smarter." Sora just crossed his arms over his chest with a displeased look on his face. The other two laughed so hard that it took about five minutes to calm down.

"That was so needed," said Riku. Mickey nodded, agreeing.

"Was not!" complained Sora. He was just ignored.

"Back to the story, then?" asked Mickey. Everybody nodded.

...You see, Ventus was missing part of his heart, his dark part. That part became Vanitas, Ven's rival and enemy...

"What does he look like?" asked Riku.

"Like Sora, but with black hair and yellow eyes," answered Mickey.

"Continue," said Riku. They were shocked at Vanitas' description though.

...Xehanort teamed up with Vanitas because he told him of the Ultimate Keyblade, the x-Blade, which can be formed. To form it, Vanitas had to fuse with Ventus since they are each other, but he wanted Ven to be stronger so Xehanort influenced Terra's dark side causing him to go away. Ventus went after him, and Aqua was sent by Master Eraqus to get them. Thus, the journeys between worlds began. Master Eraqua, though, was killed by Xehanort's influence on Terra. Their home was also destroyed. Near the end, the trio reunited to face off Xehanort and Vanitas. Terra battled Xehanort, Ven was frozen and Aqua battled Braig, Xigbar's Somebody. I came after the battle when Braig ran away and Vanitas showed up. Vanitas then fused with Ventus forming the x-Blade. We had to battle him and eventually won, breaking the x-Blade also. An explosion occurred causing Aqua and Ven to be sent into space. Master Yen Sid then collected them. After Aqua recovered, he told that Ven would be in eternal sleep since his heart left him. After that, Aqua took him and I never saw them again." ended Mickey.

"How do we help, Your Majesty?" asked Sora.

"First, we need to find Aqua for only she knows the location of Ven."

"And after that?" asked Riku.

"We do a heart-soul transfer between Sora and Ventus."

"Why?" asked Kairi and Sora.

"Master Yen Sid believes Ventus' heart is inside Sora."

"Really?" Mickey nodded. "Okay then, let's go get Aqua and wake up Ven!" he said, determined. Everybody nodded, and they walked through the Doorway to Darkness.

A/N: To be honest, I never played Birth By Sleep so I had to watch cutscenes on YouTube and read Kingdom Hearts Wiki. I wanted to tell it in my way and words so sorry if it's not accurate.

About the ages, I wanted a little change, and since this is FanFiction, I can do that. It fits to my story in the future.

Also, Riku and Mickey's roles are as comic reliefs and something else, which you'll see as the story progresses.

So, thank you for reading. Review, too. Good or bad, helpful or not, I'll take them all cause they are your choice to write them. I just enjoy writing and having people read them. See you next chapter then. DemiNintendoSun out.