Author's Note : Hi. This is my first fanfic that I've actually bothered to type up and I'm going to forewarn you of irregular orslow updates. However, if you pester me (through reviews) I will probably type quicker. Anways...Please read and review!

Disclaimer (which I forgot until now) : I do not own Katekyo hitman Reborn but I do own my OC.

Devil's Angel Chapter 1 Arrival of Devil's Angel

6am Nanimori Airport

It was 6 O'clock in the morning when Nanimori airport received a wealthy visitor. That female visitor was only a teen, not older than 18 but looking as pretty (or prettier even) than a model or superstar, with long and slightly wavy black hair tied up in a side pony tail. Yuka Hibari) was slightly tired. This was only because of the time lag between Japan and London, definitely NOT from any discomfort or bad food from her long plane trip (for she had flown in her family's luxurious private jet plane, with food more delicious and expensive than any normal citizen could afford as well as a comfortable, pillow-filled bed that sat in one of the cabins of the luxurious plane). "Nanimori hadn't changed much in 3 years", she thought, making sure that her beloved laptop was still sitting in her hand-bag, before going up to her limousine only carrying hand-luggage (Since the rest of her stuff practically filled the space in the plane and had to be brought separately, via the means of an express moving truck.). Yuka arrived 10 hours earlier than she was supposed to (How she managed to do that is beyond you and I but unsurprising to a certain person), so she decided to go shopping, and maybe visit the Nanimori middle school during their lunch-break. All in all ...to everyone else' eyes, this was just a rich but harmless girl who looked and dressed like a model. How wrong they were… the perfect reminder for us to never to judge a book by its cover.

NanimoriMiddle School

Lunchtime had just started and Tsunayoshi Sawada, known by most to be a wimp who was good at nothing but in reality, the future boss of the powerful Vongola family, was alone for once (Yamamoto Takeshi having gone for extra baseball practice and Gokudera Hayato gone sick when his half sister had come to school to bring him a Bento box…).Tsuna was going out of his way to avoid the Reception room, not just for the obvious reasons of not wanting to be bitten to death, but because the Head prefect was acting slightly strange, as if he was anticipating something. Even though he didn't have his permanent glare on (that is, until he noticed you looking), he was even less patient than normally and had rapidly bitten many rule breakers to literal death, like he wanted to get it over and done with without leaving any survivors.

Tsuna was pondering on that thought when he bumped into a really pretty girl with black hair tied up to one side, who looked about the age of a senior high-schooler and seemed to be taking a laptop from her handbag. Blushing, he apologized and was going to continue but the girl stopped him, putting her laptop back into her bag and saying," Excuse me, I'm looking for someone who goes to this school. Maybe you could help me find him..." flashing a beautiful smile and emitting a sparkling, flowery aura that was used for manipulative purposes.

No normal man could resist one of Yuka Hibari's smiles, let alone Tsuna. In a beauty-struck state with his face red as a beetroot, Tsuna nodded and stuttered, "W-W-here d-do you want to go?"

"Could you please take me to the reception room?" she said, flashing another sweet smile.

But this time, it didn't work so well. At the mention of the reception room, Tsuna snapped out of his beauty-struck daze. His survival instincts told him that no matter how pretty this girl was, disturbing Hibari-san in the reception room would lead to a slow and painful death. Deciding that for both the girl and his own sake he wouldn't take her to the reception room, Tsuna said, "I don't think you should go there…Maybe you should go to the office instead?" The next twenty seconds were the most terrifying moments of Tsuna's life so far, maybe even more terrifying than the incident with Rokudo Mukuro, but then again, most of the terrifying parts of his life came after.

Yuka's smile had dropped as she said, "Oh….Really?" in what may have been a cute innocent expression but for the presence of the creepy dark aura, with murderous intentions and scary black supernatural monsters, that surrounded Yuka. To say it was terrifying was a complete understatement, but to Tsuna, that (more than) terrifying aura was even scarier than the head prefect's glares, and that was saying something. It was even more so when you compared the aura to the completely innocent looking face she had on while emitting this aura. If such a scary aura could be emitted with an innocent face, Tsuna was even more terrified to think about the scale of terrifying-ness that the aura could emit if she was glaring…

Panicked, he stuttered, "I'll tell you where it is but I'm sorry I can't come with you, Okay?"

She paused, before nodding and smiling, the dark aura vanishing without a trace as quickly as it had appeared.

Tsuna went back into the beauty-struck daze while telling her which way to go, thinking, "How could someone as pretty as that be scary at all", before reminding himself of the terrifying experience that he wouldn't have believed if he had not seen and felt it with his own eyes and soul.

But as he watched the receding figure heading towards the Reception room, he didn't believe that it could do any harm to anything. He immediately began to feel guilty, thinking that he had sent an unknowing girl to her death by Hibari's hands, or rather, tonfas.

Kyouya Hibari sat in his comfortable recliner in the Reception room. Today was the day where his older sister, Yuka Hibari, was arriving in Nanimori after three years of travelling around, learning new lifestyles as well as fighting styles and probably inventing a tonne more of unique devices and weapons or making improvements to things, such as the time four years ago when she had added spikes to his tonfas.

Yuka was supposed to arrive at4 pm, after he would arrive home, and so he was impatient the whole day, getting extremely pissed that biting rule-breaker herbivores to death seemed to drag on now that he was waiting for the time to pass.

After all, Yuka was one of the only people who Kyouya enjoyed to bite to death (or in Yuka's case, attempt to) probably because when fighting, she wasn't a herbivore in the slightest way. Hibari had to admit that she was probably more than the carnivore that he himself was (that is, unless her fighting skills didn't improve much in three years), despite the fact that she normally looked even weaker than a herbivore, maybe as weak as the herb itself.

She was also one of the only people who weren't in the least bit scared of him (A duh…Wouldn't it be lame if someone was scared of her own little brother) and probably the only person in the world to have continuously beaten him without ending up being absolutely despised by the head prefect. As Hibari was pondering on this thought, the door opened and Hibari turned to glare at the herbivore who had interrupted his train of thought, before his glare softened into a smirk as he realised that it was his sister – the one whom his tonfas had itched to bite to death for such a long time.

"Kyouya! I missed you!" Yuka said with a smile, her greeting answered with a playful "I'll bite you to death" and a swish of a tonfa which was expertly blocked with a weapon not unlike a metal whip, with razor wire projectiles all along its length, this weapon having been seemingly pulled out of nowhere.

"You weren't supposed to come until 4" Kyouya said, his tonfas striking continuously and getting blocked continuously.

"Well.. I "convinced" the pilot that we weren't gonna die if we went twice as fast…" she replied, with a suspiciously looking smile. Kyouya smirked, already guessing the meaning of convinced. "at gunpoint of course!" Yuka continued, in the midst of swishing tonfas and silver whips, maintaining an innocent looking expression while saying this, "Anyway, I can't believe you're still using that weird catch-phrase. People can take it the wrong way, you know?" And when Kyouya started fighting harder, fuelled on by this statement, Yuka said, "Maybe it's best to take this spar back home, that is, unless you've demolished our dojo in the years that I've been away. We might accidentally obliterate your precious school you know?"

Kyouya considered this and decided that he didn't want his school to be destroyed, or damaged in any way foe that matter. And since that was nearly impossible in a fight between two of the greatest fighters in the world, he put his tonfas back into his sleeve and sat onto the couch.

Yuka opened her mouth once again, "and speaking of our house, I've added a few improvements to it. You'll see when you get home…Anyways I've heard you're your skills have improved so much that the whole town's scared of you (Of course, she didn't hear it. Being the World-Class hacker that she was, it wasn't hard to get that sort of basic info. Maybe you'd want to note that everything she suspiciously knows is info gathered by hacking.)

"I got you some souvenirs to celebrate being feared by all. I've got a new function for your tonfas. It's like a hook and grapple that can be extended. I'll install it when you get home. I also got you the highest quality Green Tea. I'll make you some now", she said, emitting her usual pleasant aura as she started to boil water. Kyouya enjoyed the food and drinks that Yuka prepared, probably because her aura seemed to seep into food and drinks that she prepared. He was glad that she never cooked when she was in a bad mood, or else the results would be worse than the cooking of a certain female member of the crowded household of the herbivore Sawada Tsunayoshi. But then again, that might be a productive way of punishing those crowding herbivores who broke the school rules. They continued with their conversation all throughout lunch while drinking green tea…

It was nearly the end of lunch when Tsuna, scared for the pretty girl, had finally gathered enough courage to creep up to the corridor which contained the entrance of the reception room. There were no sounds of fighting so he expected the black-haired girl to be either dead or unconscious at the very least. So you can imagine the surprise he got when Yuka walked out of the reception room without a single cut, saying "See you later then, Kyouya".

Completely amazed by this miracle, as well as the fact that this mysterious girl had just called Hibari-san, Kyouya* without getting bitten to death, Tsuna started to follow Yuka to the boundaries of the school and was about to continue when he noticed three drunk looking young men who seemed to also be following the pretty girl. Tsuna paused, debating what to do as Yuka turned into an unused side ally of their school. A moment later the edges of the murderous aura from before could be seen and felt slightly and the three men ran out, crying for their mothers, praying to god and swearing never to be bad again, as if they had seen a ghost (Which they had, by the way, along with the many scary mythical creatures that floated around the black aura). A few moments later, the black-haired girl walked confidently out, completely unfazed and emitting her usual pleasant and slightly sparkly aura. Tsuna's mouth dropped to the ground and stayed there until he heard the bell ring, signifying that it was the end of lunch and that he had to go to class if he didn't want to be bitten to death by a patrolling head prefect. He was going to tell his friends about this– strange phenomenon of a girl the first chance he had.

Unnoticed by them all, a certain sun arcobaleno sat in side one of his many hide-outs in NanimoriMiddle schoolwatching this whole ordeal.
He smirked, thinking, "Yuka Hibari -No… Devil's Angel, one of the most successful free-lancer hit-men (or woman in this case) in the underworld, Comparable to us arcobalenos. I can see why our external advisor suggested this girl as dame-Tsuna's Wind guardian, the one who moves freely around unnoticed, though wreaking havoc as she strikes. We simply must have the Devil's Angel and her brother join the Vongola."
Reborn would create a scheme to lure her and her brother into the Vongola family. But first things first, he would find out everything there was to find out about Hibari Yuka and her alias Devil's Angel, not just what he had heard from the external had already gotten files about Yuka Hibari herself from the governments' SC database which contained files on all the underage people who were certified to live alone.

Name: Hibari Yuka

Age: 18

Blood Relatives : Hibari Kyouya -little brother

Other Relatives: Sakurai Tanaka- maternal second uncle-in-law (maternal great Aunt's daughter's husband, owner of Sakurai Incorporations.)

Appearance : Attractive Japanese. Black hair, dark eyes, fair skin (see photo)

Life summary: Yuka Hibari is a child prodigy despite being raised without parents. She graduated from high school from the age of 12 and is suspected of doing online university courses from even before that. She studied at NanimoriUniversity for three years, achieving many mathematics, engineering, computing, science, weaponry design, etc decrees in this short period of time. She then started to travel around, going to various countries all over the world and learning many other languages, all while continuing more university courses online. She has had a very recent change of address back to Nanimori town.

It wasn't much, but there should be far more to be found out about the Devil's Angel and he would pay hackers to find this information. Slightly ironic, if you think about how Reborn was paying hackers to find information about one of the greatest hackers there are. Obviously, one who's good at hacking is just as good as protecting computers (or in Yuka's case, her beloved laptop) from hackers, and anything that she didn't want to be known, would be extremely hard to find out.

Hibari Kyouya went home to find that a patch of what used to be forest behind his Japanese style shrine–like house, had been demolished and in its place there was a modern high tech building which probably contained all of the gadgets and gizmos that Yuka had ever designed or invented. Although Hibari didn't understand why Yuka could be bothered with technology in the first place (or traveling around away from Nanimori for that matter), he had to admit that the spikes she had installed into his tonfas were very useful and he was impressed that the building could be built in the mere hours in which he was at school.
He smirked, anticipating the fight ahead as he walked into his house and towards the dojo (which he saw had been coated with some metal or other, probably titanium). And he wasn't disappointed, not that he would ever be disappointed about a spar with Hibari Yuka. The fight took place, the beginning of a string of daily spars ahead, all in which Yuka used different weapons (this time it was a type of sword), and all at speeds impossible to follow to an untrained eye.

* In Japan, only close people call each other by their first names (even Yamamoto and Gokudera aren't on a first-name basis, let alone someone like Hibari)

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