Demons vs. the Dark Lord

By: Hikari Mizu

Since doesn't allow CYOAs, I'll just do a crossover of YYH and HP. I've always written CYOAs for YYH, but never, a crossover for it. Please forgive me if there's some mistakes. And there will be only two OCs now, and a few that might show up once in a while. If there's any mistakes, please tell me in your review!

Summary: The Spirit Detectives receives a letter from Hogwarts, asking them to teach and protect the school from the Dark Lord and his fellow demons. How did the demons came to Ningenkai? Didn't Koenma said there was a barrier stopping a few? Then, why are there over five hundreds demon working with the Dark Lord? What's up with the two girls? How are they related to Koenma? Read on and find out! Flames are totally accepted.

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He sighed as he create a portal to Reikai, going to a meeting. His red hair ruffled in the soft wind, clearing out his emerald eyes. Kurama stepped through the portal and headed towards a big golden door. He pushed the door opened and stepped in, greeted by a blue hair maiden, who practically jumped on him.

"Botan-chan," Kurama muttered, stuggling to get her off him. "You're going to asphyxiate me like this."

"Asphy-what?" Botan asked as she let him go.

"What I meant was suffocate," Kurama said, smiling softly as his friend. "Is everyone here yet?" Botan nodded and led him deeper into the room. They stopped in front of a desk with a chair facing the wall. "Koenma," Kurama greeted. The chair turned around to face him. On the big, black chair was a toddler with brown hair and brown eyes. On his head, he wore a hat that has the word "Jr." written on it. In his mouth was a pacifier.

"Now that fox boy is here," a voice said from Kurama's left said. He has black, slicked back hair and brownish reddish eyes. He wore a green suit. He's the leader of the Urameshi Team for the Dark Tournament. His name, Yusuke Urameshi, a punk at his school. On his left stood a tall boy with orange Elvis hair and small, black eyes. He wore a blue suit. His name, Kazuma Kuwabara, or as everyone called him Kuwabaka. Near the window, stood a boy in all black, except for his headband and shirt. He has black, defying gravity hair with a starburst. His crimson eyes held the world "death" in them as they were staring out the window. His name, Hiei Jaganashi, as Kuwabara called him "Shrimp." "What do you need from us?"

"I want to announce that Kurama will be in England," Koenma said, "but then, he needs someone to go with him. Any volunteer?" Koenma looked around, and sighed. "Very well then, Botan, you go with him."

"But sir!" Botan exclaimed. "I'm very busy tomorrow! I can't go. Why won't you make one of those three go?" Apparently, Botan didn't want to go.

"Fine," Koenma huffed, "Hiei, you go with him."

"Hn," Hiei spoke up, "why should I go with the fox? Make the detective go."

"Kuwabara and Yusuke can't go," Koenma said, "they need to meet someone in an hours. And you two," Koenma indicated Kurama and Hiei, "are going to England whether you like it or not."

"May I ask, Koenma," Kurama spoke up, "what are we looking for?"

"There's a human in Makai in England," Koenma explained. "A portal has been opened and left opened for almost one hundred years now. During June, he fell into the portal, and got transported to Makai. The only way to get to that section is to go through that portal. I contacted a worker at that place, and he agreed to lend you two a hand. You two will leave you tomorrow morning on a nine o'clock flight to straight to England."

"Hn," Hiei said before flitting off. Koenma looked at Kurama who just nodded.

Meanwhile at Privet Drive in England, a sixteen years old teenager was lying in the garden, staring at the sky. Sweats were rolling off his face. After running fifty laps around the garden of the Dursley's, Harry Potter was quite exhausted. He was used to it. After Moody's warning, the Dursley was quite nice to him. They didn't boss him around…much. They only gave him certain chores, on certain days, but not too much.

When he stood up, his messy jet black hair fell in its place, blocking his thunderbolt scar on his forehead. He pulled his glasses out from his pocket and placed them on before going inside for nice cold shower. When he entered the kitchen, it was empty, not to mention the living room. Until he saw a note on the refrigerator from his Uncle Vernon. The note states:

'We won't be home until nine tonight. Cook your own dinner. Do not destroy the house. Wash the dishes after you are done. Do your regular chores for tonight. Don't wait up. Vernon.' Harry scoffed before crumpling the paper into a ball and threw it into the wastebasket. Harry went upstairs for a shower before cooking his dinner and did his chores. It was around eight thirty when he was done with everything, so he went up to his room and did his homework.

Back in Japan, Kurama was getting ready for the next day trip, meanwhile in Reikai, Yusuke was arguing with Koenma.

"Listen up, toddler," Yusuke said, "you better let me know where's grandma is or you'll get it!"

"I promised Genkai that I won't tell you," Keonma said, "but you will find out soon enough!"

"I WANT TO KNOW NOW!" Yusuke slammed his fist on Koenma's table. "Plus, who are we supposed to meet?"

"Now that you mention it," Koenma said, all of the sudden he shouted: "I FORGOT TO TELL THOSE TWO WHO THEY'RE SUPPOSED TO BE LOOKING FOR!" Koenma is now running around the office, screaming his head off. "WHAT SHOULD I DO? WHAT SHOULD I DO? THAT'S IT! BOTANNNNN!" Botan came running in.

"Yes Koenma, sir?" Botan asked, gasping for air.

"Deliver this folder to Kurama," Koenma said, handing Botan a folder.

"YES SIR!" and Botan flitted off to Ningenkai, looking for Kurama.

"You will be meeting two girls," Koenma said, "one of them is my cousin, and the other…my adopted sister." Koenma shuddered when he mentioned his sister. "The destination point will be at Mystique Café in half an hour. They will talk to you about the next mission and where it will be located at and when it will start. They'll recognize you two when you walk in the café. Get it?" Kuwabara nodded dumbly, drooling over the thoughts of girls. Yusuke just muttered 'yeah' before walking away. Kuwabara ran after Yusuke, calling him. Koenma sighed before he plopped down onto the ground, falling fast asleep. (::blinks:: Ehehhe…sorry, I'm quite bored.)

When Kurama got the folder from Botan, he immediately read it. After reading, he stuffed it in his bag. After he stuffed the folder in his bag, he walked outside, taking a walk in the park. It was around ten at night and he guessed that Yusuke and Kuwabara were meeting the two people that Koenma mentioned.

In Mystique Café, Yusuke and Kuwabara sat across two girls. One has shoulder length auburn hair with dazzling amber eyes, and the other has soft brown hair with crimson eyes.

"My name is Mizu Li," the one with crimson eyes said, "Koenma's adopted sister."

"And I'm Yume Tai," the other one said, "Koenma's cousin, twice removed."

"I'm—" Yusuke got cut off by Yume.

"We know who you are," Yume muttered. "Yusuke Urameshi and Kazuma Kuwabara. Koenma told us about you, how you won the Dark Tournament, and all. But too bad, that Keiko left you." Yusuke was glaring at Yume. "Because you're never around her, she had to leave you. Plus, you two always argue about nonsense stuff, and you guys don't match for each other."

"She stalks you," Mizu said, smiling, "she…erm…said she needs more information if we're working with you guys until next June." Yume punched Mizu on her shoulder. Mizu didn't even wince, except, she just smiled. "Used to it."

"What's the mission that we need to talk about?" Yusuke asked.

"Once you got a letter a from an owl," Mizu said, "meet me at this address." She handed him a paper and walked off.

"Don't worry," Yume said, "we already paid. See you then!"

"Wow…" Kuwabara said, "they're hot!" Yusuke had to drag Kuwabara out the café.

"Go home, ya big oaf," Yusuke muttered, walking towards his apartment. He remembered what happened between him and Keiko.

FLASHBACK

"Yusuke," Keiko said, "our relationship ends here."

"What do you mean by that?" Yusuke asked, standing up. They're currently at his apartment. Keiko had called him and wanted to tell him something.

"With you and all of your missions," Keiko said, "we never get a chance to be alone. So, it's best if we end it right now." Yusuke just nodded.

"Whatever," Yusuke said. "But…if I'm always by your side…will you come back to me?" Keiko shook her head. "Why?"

"I'm in love with someone else," Keiko whispered. "Bye Yusuke. I'll see you at school, I hope." She walked out of Yusuke's apartment, leaving him in shock.

END OF FLASHBACK

It had been a year already. Once in a while, he would see her clinging to a boy's arm, walking around the park. Just a few months ago, they got married. Yusuke sighed and walked up the stairs to his apartment. When he entered his room, an owl was waiting for him.

"What the hell?" he said aloud to no one. He took the letter from the owl and read it. His eyes widened as he read the letter.

HOGWARTSSCHOOL of WITCHCRAFT and WIZARDRY

Headmaster: Albus Dumbledore

(Order of Merlin, First Class, Grand Sorc., Chf. Warlock, Supreme Mugwump, International Confed. of Wizards)

Dear Mr. Yusuke Urameshi,

It will be an honor for you to teach Fighting Tactics at Hogwarts. Koenma has informed me on your fighting skill. Please keep your identity as a demon enclosed. Please reply before the end of July. Term begins on September 1st. You will stay with the Weasleys, who will pick you up at the airport in two days in England. Koenma will hand you your ticket once you reply. You will leave at King Cross Station in England

Yours sincerely,

Albus Dumbledore,

Headmaster

Yusuke's mouth dropped to the floor. "Me, teaching? This got to be a joke." He then remembered that he got to meet Mizu and Yume at a certain place when he receives his letter. Without reading the other page, he ran towards the address, only to have Kuwabara followed him.

At Privet Drive, Harry was in his room doing his homework, until two owls came. One he recognized as Pig and the other one, he guessed was a Hogwarts owl. He opened Ron's letter first.

Harry!

We're going to pick you up in two hours! Well, I think five minutes after you receive this letter. Sorry for the late notice! I just found out this morning. Hermione's said she's somewhere in Japan. Rubbish, I think. I mean, there's not even a single wizards or witches in Asia! Well, the last time my dad checked. We'll be coming, get packing, mate!

See you soon,

Ron Weasley.

It took him one minute to read the letter, and two minutes to sort things out, and he got two minutes left to pack. Pack…Harry ran around the room, stuffing all of his things in his trunks.

Back in Japan, where Yusuke and Kuwabara were catching their breath as Mizu and Yume were laughing. Soon, tears were in their eyes.

"It's not funny," Yusuke said through gritted teeth. "You guys knew this would happened."

"Yume and I needed some amusement anyways," Mizu said, smirking. "Anyways, just agree to the letter. We'll be fighting demons at the end of May."

"Why can't we be students then?" Kuwabara asked.

"Hogwarts don't accept transfer students," Yume replied, while smiling. "Eh…hmm…I'm forgetting something…what is it Mizu?" Mizu just shrugged. Yume snapped her fingers, "Of course! I'll show you the pictures of who will be picking us up! Come on in!" Yume and Mizu dragged the two in, Yume was dragging Kuwabara by his collar, and Mizu was dragging Yusuke by his ear. (Ouch…that got hurt, ne?)

"OW!" Yusuke screamed. "LET GO OF ME!" Mizu continued to drag him until they reach the living room. Yume showed the two a portrait of a family with red hairs and freckles. In the portrait, there were nine people, and what seems like the twins were messing around with the youngest boy's hair while the two eldest were glaring at the two troublemakers. "That's them?" Yume and Mizu nodded.

"Oh," Mizu said suddenly, "we'll see Kurama and Hiei at the same place, aren't we Yume-san?"

"Hai!" Yume replied. "Plus, Mizu-sama, how will we know where to get the supplies?"

"Eh…I think the Weasleys will help us there," Mizu said, "and do not tell everyone that we're the professors there. Dumbledore said it's going to be a surprise."

"YOU MET THAT OLD MAN?" Yusuke shouted.

"Eh…just after you left," Yume said, smiling and sweat dropping at the same time.

"And don't tell Koenma that we told you this," Mizu said, "but…we'll also see Yukina and Genkai at Hogwarts, too. Yukina is the new nurse at that school, and Genkai is the professor for Training." Yusuke winced.

"Poor students," Yume said, "have to go through Genkai's training." Mizu and Yume shook their head.

"GO HOME NOW!" Yume and Mizu shouted while pointing to the door. Yusuke and Kuwabara sweat dropped as they left the house.

"So," Kuwabara said, "do we pack now?"

"I guess so," Yusuke said, "wait, no, tomorrow we will. Now, all we have to do is enjoy our last two days here!" Kuwabara and Yusuke raced to the arcade, passing a girl with bushy brown hair.

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And I shall end it there. Seven pages in Microsoft Words! Eh, I'll try to make the next chapter longer! Review! Oh yes…I do not own YYH or HP…or else…I won't be sitting here…ehehe…JA NE!