Summary: Crossover of Kingdom Hearts, D. Gray-Man, and Harry Potter. The Earl discovers the other worlds, and decides to take over them all. Sora and Riku are sent to find the source of a new enemy, and way to fight it. Meanwhile, Dumbledore is worried about the possibility of Voldemort trying to use the akuma. Four days before the start of term, four strangers appear. They know a different kind of magic, and Dumbledore allows them to stay at Hogwarts for the year, in exchange for teaching the students their magic.

A/N: I'm ignoring the time difference between DGM and HP for the sake of my storyline. Takes place shortly after KHII, right after the end of the anime in DGM, and fifth book Harry Potter.

"Normal talking"

"Nobody talking in their somebody's mind" (or the 14th with Allen)

Somebody thoughts/responding to nobody

"Nobody talking, separated"

Just so nobody's (pardon the pun) confused about all that. Enjoy!

Prologue

"What is that thing?" The ball-shaped creature shot rapid bullets at the two keyblade masters, several almost hitting their mark.

"It's not a heartless or a nobody. We could possibly be facing a new enemy..." Roxas trailed off.

"Sora! Look out!" Riku threw his keyblade, knocking the oncoming bullets out of the way.

"Thanks Riku!" Sora leaped at the creature, hitting full-force with the keyblade. The thing was barely dented, and Sora had to flip out of the way quickly as a different one shot at him. "I can't hit it!"

"Try moving faster!"

Sora ducked, blocked, and ran over to Riku. "That's not what I meant! I hit with enough force to kill a strong heartless, and it's barely got a scratch!" The duo blocked another volley of bullets.

"Get to the gummi ship! We've gotta get outta here!"

x~X~x

Finally found one. "Wake up everybody! Finally found a new world!" Keita shouted.

"This one have a name?" Kuro asked. Keita rolled his eyes.

"I've already told you. Only worlds in the Disney sector have names."

"Right, sorry. Any heartless in this one?"

"Don't know, don't care, we're getting out of this ship finally!" Kae jumped out of her bunk, landing lightly on the floor.

"Besides, without a keyblade master it's pointless to check. We'll just see if there's anything to do there." Yuuma landed beside her.

"There's gonna be plenty to do." Keita announced.

"How do you know?" the ever-skeptical Kae wondered aloud.

"I don't know, but that castle looks promising." He motioned out the window where, sure enough, an ancient-looking castle stood out among everything else.

"There's a huge white one over there, too. Which are we going to?" Yuuma pointed off to the side.

"Ancient-looking." Kuro answered him immediately.

"Yeah, it looks way more interesting." Keita steered the ship into the woods beside the castle. The doors opened at the push of a button. "Everybody out!"

A/N: Keita, Kuro, Kae, and Yuuma are all original characters. So no, you didn't miss anything canon. You'll officially "meet" them next chapter, I think.

x~X~x

"Komui? What did you want?" Allen walked into the supervisor's ever-cluttered office.

"Ah, Allen. I'll explain when Kanda gets here." Komui said from behind his desk.

"Yu-chan's coming too?" Lavi appeared behind a stack of papers. He was answered by an angry Kanda, who burst through the door and almost crushed Allen in the process.

"What do you mean I have an assignment with Lavi and Beansprout?!"

"Ah, Kanda, you're here. I'm sending you three to a school that may contain innocence."

"A school?" the three exorcists shouted in unison.

"Yes. Hogwarts School of Witchcraft and Wizardry, to be exact." Allen and Kanda looked at Lavi.

"Hey, I've never heard of the place. Don't look at me."

"Che. Magic doesn't exist." Kanda turned and left the room before anyone could stop him.

"So, what's this school all about? And how did you find out about it?"

"Apparently, the headmaster was attacked by akuma, and ended up meeting General Nyne. He asked her about what they were, and she told him in exchange for information on the magical world. The chance of an innocence being at the school is low, as apparently magic is common, but he's asked us to protect his students. Some self-proclaimed Dark Lord has 'risen', whatever that means, and he may try to use the Earl's akuma to attack the school. Their magical government denies that he is back, and won't do anything to help." Komui paused for air.

"So you want us to go there and make sure this doesn't happen." Lavi looked somewhat excited.

"Exactly. The only problem is, you'll be going undercover as students. I've gotten potions that will make you the proper age for the first year."

"They're not permanent, are they?" Allen looked a bit concerned.

"No, all you have to do is drink the antidote at the end of the year and you're back to normal."

"Good."

"And since Kanda doesn't believe in magic and will definitely refuse, I'll get Lenalee to pour his potion into his sake at breakfast tomorrow. After you two are done eating, drink yours and come up to my office."

"Sounds good. Bye Komui!" Lavi left. Allen glared at the supervisor for a moment before leaving. He hated assignments with Kanda. And this one was going to be a year long...

x~X~x

Next week, in Dumbledore's office:

"Albus, I allow you to do what you will to some extent, but this is too much! I'm doing you a favor by supplying you with a Defense Against the Dark Arts teacher, and I expect you won't mind returning the favor by allowing me to post dementors at the school, at least this one year?" The minister said it like a question, but Dumbledore could tell that he expected to be agreed with.

"I will not allow them inside the castle, but they may patrol the grounds."

"Why won't you allow them inside?" Fudge demanded.

"The reason hasn't changed since last time, Cornelius."

A/N: If anything other than the dementors at Hogwarts is wrong for the fifth book, it's because I changed from the fifth without dementors to the third with Umbridge and finally to the fifth with dementors. I might have missed something, so just try to go along with it.

So anyway, hope you enjoy! R&R please, and this is my first fanfic (because I'm not counting the crack one).