I am so surprised when I know this story gets review from you all….Thanks a lot. I also publish it in Hunter X Hunter, The Prince of Tennis, and Bleach crossover!

Enjoy! R&R please!

Light Lamperouge

Disclaimer: I don't own Harry Potter, Bleach, The Prince of Tennis or Hunter X Hunter

2. The World of Cell

Zoldyck Mansion

"Are you really serious to attend that school?", Gon asked Killua seriously.

"You're the one who said I must go there", Killua replied. One of his servants already sent back his letter to the school. Now, he dressed up himself. According to the plan, he would leave this mansion today.

"This house will completely awful silence after you go"

"I also will be alone if I don't go. You want to go to Angelos city, right?", Killua said.

"Hmm"

"Young master, everything has done. We also have called one of our loyal companion, which is a wizard, he will accompany you to look around and buy the equipments you need"

"OK"

"He's waiting for you, in the living room now"

"I'll come", Killua walked to the living room. Gon followed him outside.

A short haired man with black eyes sat in the sofa, next to him, sat a black-green tinted haired boy who seemed so bored. When Killua entered the room, his servant introduced them.

"Young master, this is Echizen Nanjirou and his son, Ryoma. Echizen-sama and Echizen-kun, this is Master Killua and his friend, Master Freecss", Killua

"I heard much about you two. Ilumi said that you are so talented, Killua-kun. And I already met your father this summer, Gon-kun. He's well", that man talked much. Killua smiled bitterly. Had Ilumi said other things about him to this man? Meanwhile, Gon's face became so happy. He asked Nanjirou much about his father and the man answered his questions happily.

"And from my adventure in Europe, I met Ilumi. I helped him. He's so cold hearted, ya. Not like you two. You're sweet and cute. More like my son, Ryoma", Gon face turned to Ryoma, which Ryoma just gave him his I-don't-care look. And Killua just stared Nanjirou, unbelieved with the sentences he said. That Ilumi needed Nanjirou's help? It meant that Nanjirou wasn't his brother's companion for killing, but his companion as friend. This was surprised him much.

"Time's up. The plane is ready", his servant said.

"Oh, OK", Nanjirou replied.

"Sayonara Gon", Ryoma said good bye which made Gon's surprised.

"See you next year Killua, Ryoma", Gon said. Gon wanted to stay in Angelos until January, which made he and Killua wouldn't meet until summer holiday next year.

"Be careful young master", his servants said.

They entered the (Zoldyck Private ) plane and it flew to England.

Seireitei

His subordinate had sent a letter to Hogwarts. Hitsugaya Toushirou now was walking to the 1st Division because Yamamoto wanted to tell him the full detail of his mission.

"You have to help an organization. This organization's name is The Order of The Phoenix, but you must help them in secret. The only one who knows your existence is my old friend, Albus Dumbledore. He is the one who contact me for help. He won't tell anyone about you or about this place"

"And what's this organization's purpose?", Hitsugaya said curiously.

"To fight Lord Voldemort and the death eaters"

"Voldemort"

"Also called He Who Must Not Be Named or Do You Know Who", Hitsugaya thought, what a weird thing? Why people are afraid to call him Voldemort?

"He's the most feared wizard in century", that's the explanation.

"And why I must disguise as a student?", Hitsugaya asked.

"Because your mission includes protecting Harry Potter, the boy who lived when Voldemort attacked him with killing curse 15 years ago. He had messy black hair, a thunder-shaped scar in his forehead, wears glasses, and always against the rules"

That was a surprised for Hitsugaya. He needed to protect a boy.

"How old is he?"

"Fifteen years old. He will be in his 5th year"

"And I will be in-"

"First year, any question?"

"No", Hitsugaya said. It was so rude when he ordered to protect a child, and he will be disguised as 11 years old boy, and that Potter was 15 years old.

"Then you will come to England this 11 am. Sasakibe-fukutaichou waited you in the west gate in 10.45"

"Hai, Soutaichou"

"You may dismissed"

Hitsugaya went to his home instead his office division. He prepared his clothes, like t-shirt, shirt, and pants. Wizard could see shinigami well, so he didn't need to use his gigai.

After that, it was 10. 30 Am., he still had time to meet Matsumoto. He entered his office while his subordinates greeted him quickly and he saw his lieutenant slept in the sofa, and the paperwork now was standing so high like the mountain.

"MATSUMOTO….", he yelled.

"Ta-ta-taicho", his lieutenant wake up and saw him, without his haori or shihakusou, now he wore deep green t-shirt and jeans.

"I will go to the world for one full year. Do your works or there's won't be sake in ten years", and then he shunpoed to the west gate.

The next second,

"NOOOOOOO….", Matsumoto screamed and Hitsugaya who arrived at the west gate smiled. He entered the Senkaimon and came to England.

(A/N : Just skip their activities in the Diagon Alley since I have no idea what should I write and I don't read the scene of the golden trio in Diagon Alley in the book. Hitsugaya's wand was 20 cm, from willow and ice dragon heartstring, Echizen's from pine, 25.5 cm, with phoenix feather, and Killua's 28 cm, from ash with unicorn hair)

King cross station

Hitsugaya was looking for the platform. His platform was 9 and ¾. He looked worry, his train would departure at 11 am and it was 10.55 now.

He looked at platform 9 and 10. Could the platform was between the 9 and 10?

He breathed deeply, looked around and noticed that no people watch him carefully and ran. He felt the sensation like he just entered to another dimension and looked around and felt relief. The Hogwarts Express was waiting for him.

He tried to find an empty compartment, but seemed to fail. Then, in the last compartment he asked a round faced boy.

"Could I sit here?"

"Of-of course", the boy replied. There are also a platina-blonde haired girl who read a magazine upside-down, a red haired girl, a silver-haired boy, a black-green tinted haired boy, and a messy-black haired boy whom he guessed as Potter according to Soutaichou's explanation.

So, Hitsugaya put his trunk and sat next to the silver-haired boy.

"What's your name?", they silver haired boy asked him.

"Toushirou Hitsugaya", he replied.

"I'm Killua. This is Ginny, and the blonde girl is Luna, that's Neville, and he's Ryoma", Killua pointed each of them.

"Nice to meet you", he added.

"Anata wa doko ni sunde imasu ka", Ryoma asked him, made Hitsugaya's surprised.

"Seireitei"

"Nani", Ryoma asked more. Their conversation in Japanese made Ginny and Nevile were surprised.

"Shinigami", Killua whispered. Hitsugaya felt unbelievable. This boy knew that he was a shinigami.

"I've read them a lot", Killua explained.

"Uhm", Ryoma was back to his silence mode.

"Watashi wa Zorudikku Kirua. Kore wa Echizen Ryoma. Yoroshiku"

"Yoroshiku", had friends from Japanese made Hitsugaya was more comfortable than before.

"You three are foreigners, right?", Neville asked them.

"Yes"

"Which year-"

"First", they said together.

"And your age?"

"Twelve", said Killua.

"Twelve", from Echizen.

"Eleven", Hitsugaya replied.

"But, why-?"

"Because we just got the letter this summer", Ryoma replied coldly.

They didn't have any conversation again since Ginny was too shy whenever he saw Ryoma's and Hitsugaya's face or when Killua smiled at her frequently. Luna still read his magazine and potter didn't do anything. Neville was touching and staring his Mimbulus Mimbletonia.

Ron and Hermione did not turn up for nearly one hour, by which the time the food trolley Hitsugaya had already refused to buy anything, and so Ryoma did. However, Killua bought all the trolley for them.

"I am sweet-tooth. Yes", he answered Ginny's questioned face and smiled, made her blushed than before. Then he began to eat the Chocolate frog.

Harry, Ginny, and Neville had finished their pumpkin pasties and were busy swapping chocolate frog cards when the compartment door slid open and they walked in, accompanied by Crookshanks and a shrilly hooting Pigwidgeon in his cage.

"I'm starving", said Ron, stowing Pigwidgeon next to Hedwig, grabbing a Chocolate Frog from Harry and throwing himself into the seat next to him.

"Well, there are two fifth year prefects from each house", said Hermione. "Boy and girl from each", she added.

"And guess whose Slytherin prefect?"

"Malfoy", Harry said bitterly, certain his worst fear would be confirmed.

"Yeah. And that complete cow Pansy Parkinson", Hermione said viciously.

"Would you please to shut up your mouth, now?", Ginny said with sarcastic tone which made Harry, Ron, and Hermione stared at her, disbelieved.

"They just slept now", she added. Then Ron and Hermione looked to the seats in front of them, saw three boy who just slept now. They slept so deeply.

"Three midget"

"Shut up, Ron!", Hermione said.

"Are they first year?", she asked Ginny.

"Yes. From Japan, I think"

"Interesting!", Hermione said happily.

30 minutes spent in silence.

"Ah, I can't stand longer"

"I wake, so you can yell again", Hitsugaya said. Echizen and Killua woke up too.

"I am Hermione Granger. This is Ronald Weasley, and what is your name?"

"Toushirou Hitsugaya"

"So, Toushirou-"

"It's Hitsugaya"

"Bloody hell-", Ron said.

"People in Japanese use the family name first cause it's impolite if you call them by first name unless you're so close to them. By the way, I'm Killua Zoldyck, but you can call me Killua instead of Zoldyck", he explained." And this is Ryoma Echizen", Killua added.

"Owh, OK", Hermione said.

"How old are you?", he asked Ryoma.

"Twelve"

"But I'll never see you around"

"They've got the letter this summer, so they will be in first year", Ginny added.

"That's make a point", Hermione said, and then the compartment door opened for the third time. Draco Malfoy was smirking at Harry between his cronies, Crabbe and Goyle.

"What?", he said aggressively before Malfoy could open his mouth.

"Manners, Potter, or I'll give you a detention", drawled Malfoy,"You see, I, unlike you, have been made a prefect, which means that I, unlike you, have the power to hand out the power of punishments"

"Yeah", said Harry," but you unlike me,-are a git, so get out and leave us alone"

Ron, Hermione, Ginny, and Neville laughed. Malfoy's lip curled.

"Tell me, how it feels being second-best to Weasley, Potter?", he asked.

"Shut Up, Malfoy", said Hermione sharply.

"Why you just stand there? Didn't you hear her?", Ryoma asked him, while Hitsugaya and Killua glared Malfoy.

"Three midgets protect you, Potter. One white haired, silver haired and black-green tinted. Hey, You all dyed your hair, right?", Malfoy smiled sarcastically.

Hitsugaya couldn't think normally. This guy was awfully annoying.

He better shut up or I will Daiguren Hyourinmaru his ass.

He stood up and came face to face with Malfoy.

"Don't take my portion, Shiro-chan", Killua said and followed him. Echizen also stood up. Hitsugaya usually would protest if someone called him Shiro-chan, but his attention now was full at Malfoy. They walked far from Luna's compartment.

"Do you all know about the unforgivable curses?", Ryoma asked. Malfoy was surprised.

"Yeah, why you don't do it to us?"

"Anything you want. Avada Kedavra", Malfoy pointed his wand to Hitsugaya and yelled. At the same time, Crabbe also shouted,

"Crucio", to Killua.

"Imperio", to Echizen. But the unforgivable curses didn't have any effect to them.

"You still have lots more to work on", Echizen said. And they three walked back to their compartment.

For explanation, Echizen activated his State of Self Actualization when Goyle cursed him. Having been repeatedly tortured since birth, Killua has been conditioned to possess extreme tolerance for poison, electricity and pain, so the Cruciatus curse didn't work for him. And for Hitsugaya, you all know that the killing curse didn't have any effect since he was already dead. Please give me review so I can write the next chapter better. Happy Hallowe'en!

Japanese sentences :

Sayonara (Good Bye)

Anata wa doko ni sunde imasu ka.(Where are you from?)

Watashi wa Zorudikku Kirua. Kore wa Echizen Ryoma. (I am Killua Zoldyck. This is Ryoma Echizen.)

Yoroshiku (Nice to Meet you)

Nani (What?)

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Light Lamperouge