A/N: Ahahahaha here it is, the next chapter. This is sorta a fun and a bit of a filler chapter, but important nonetheless. Enjoy :P!

Vongola Head Base: Japan Division

Vongola Decimo was a name both feared and revered throughout the criminal world. His power and authority pulled the strongest mafia famiglias and their weaker allies into an alliance that unified them all under one cause. He was as legendary as his predecessor, Vongola Primo, and the Decimo had completed Primo's dream of restoring the mafia to its original position as 'Guardians of the People'. The Decimo was most powerful man in the world—

So why was he sitting at a worn out desk rifling through mail and paperwork?

"Proposal, proposal, proposal," said Tsuna miserably while he threw letter after letter into the growing trash pile. "A letter that claims it has urgent information—that is a proposal in disguise?"

Tsuna slammed that letter into the pile and glared at it in disgust.

'When Tsunade asked me to take care of her mail for her, I never expected her persistent suitors to be encouraged to send more marriage requests,' he thought miserably. Even as that thought passed through his head, he knew that the increase in proposals had been inevitable. As her brother and boss, Tsuna had the power to arrange a politically advantageous marriage for Tsunade—not that he would ever dream of doing so.

Tsuna sighed and put down the weapons contract he had been reading, tracing a deep groove on his table that had been made nearly a decade ago.

'There's no way I can pair up my hot-tempered, dangerous, homicidal sister with just anyone,' he thought, his mind wandering to the past.

When Iemitsu had announced his adoption of a hapless orphan and sent her off to 'train' with Reborn, his direct family had some mixed reactions. Nana, as usual, was delighted to have a daughter in the family. Tsuna, on the other hand, thought his No-good father either wanted to make up for his lost years of fatherhood by adopting another child, or he was going insane because of his decision to send her off with Reborn.

Either way, Tsuna didn't want anything to do with his 'sister' since he already had a lot on his plate, bringing the mafia famiglias under one cause and all. However, he should've known he couldn't avoid her forever, because where his sadistic tutor goes, so does the unfortunate student.

A few days after the Vongola Hitman Competition was announced, Tsuna had been busy with the large stack of paperwork that came with the organization of the contest. After many mugs of coffee, cups of tea, and hours of tirelessly reading and signing papers, Tsuna finally got the stack of papers to a manageable pile—when something came flying through the window and kicked Tsuna in the face.

Usually, Tsuna would've been up and about in no time, Sky Flames blazing, searching for the possible threat. However, he had been kicked in the face enough times by that boot to recognize who it was.

"Cha-os," said 10-year old Reborn, who was just regaining the voice necessary for his old greeting. "I see you still leave the window wide open to outside threats. Haven't I taught you anything, dame-Tsuna?"

Tsuna groaned and sat up. "Only you would be able to get past the security perimeter outside to get close enough to barge through the window," he said, staring desolately at his papers that were now mixed up and drifting silently to the ground. "Those guards were hand-picked through special trials set up by me and my guardians."

"Oh, I didn't even have to defeat the guards," said Reborn, leaning smugly against the wall, as if he knew something Tsuna should. "However, you'll still find them unconscious and restrained in Building 4."

'Wait, only Reborn has the power to take out my guards,' thought Tsuna, confused. 'But if he didn't touch them, then who—'

Before Tsuna could finish that thought, something came flying out of nowhere straight towards Tsuna. He barely managed to jump out of the way, and the unidentified object embedded itself in the table with a 'thunk'. Taking a closer look at the object, Tsuna realized it was—a playing card?

"Looks like Reborn severely downplayed your abilities," said a voice in the corner. Tsuna spun around to face a figure of small stature in the corner, wearing a red fedora that covered her eyes. "If you were really as bad as Reborn thought you were, you would be bleeding to death right now."

While Tsuna gaped at her, the figure looked up to reveal a pair of stunning green eyes. "Think of a card, any card," she said, chuckling a bit. "Then take out the card in the table."

Nodding numbly, Tsuna pulled out the card and was shocked to see that it was the seven of spades—the exact same card that had popped into his head when she asked him to think of a card.

"How did you—" he stammered, gesturing back and forth between the figure and the card. "When did you—" Tsuna took in a deep breath, attempting to calm himself down. "Who are you?" he finally asked.

The figure stood up straight and extended a black gloved hand. "Ciaossu, my name is Sawada Tsunade," she said, smiling slightly. "Nice to see you, onii-chan."

The moment she said that, Tsuna felt a burst of affection for her. It startled him since he hadn't really cared much about his adopted sister or what happened to her, other than a little pity for being Reborn's student. However, seeing her for the first time, he couldn't imagine being anything but her brother.

This reaction confused him, and he flinched as a wave of pain coursed through his head. Tsuna noticed that, though her reaction was much smaller, Tsunade had winced at the same time he did. It was then that Tsuna realized they both were more closely connected than they had originally thought. Looking into Tsunade's intelligent eyes, he knew she was thinking exactly same thing.

Tsuna would be staying in contact with his sister from now on.

He grasped her hand firmly. "It's nice to finally see you too, Tsunade-chan."

Tsuna sighed again. Ever since then, he had been keeping tabs on Tsunade and Reborn, checking in on them every time they needed or completed a mission. There was something connecting him and Tsunade other than their eerily similar appearances that he couldn't quite place. All mysteries aside, he did care deeply about his sister, and he wanted to grant her the happiness that he knew she wouldn't receive in an arranged marriage. At the same time, Tsuna worried that she would become a workaholic like Reborn, and the idea of a second Reborn him shudder.

While preoccupied with his thoughts, a tiny bird landed on the window and began to chirp. Tsuna smiled and turned his attention to the bird's song, relieved for such a normal thing to interrupt his insane routine. Sometimes, it was nice just to look at the bright blue sky, smell the fresh air, feel the cool breeze, hear the tickings of a bomb as it flew closer…

'Wait WHAT?!'

Tsuna dove away from the window and under the table just as the bomb detonated, shattering the glass and sending smoke and papers flying everywhere. He peeked over the edge of the table, coughing and waving the smoke away. Two voices spoke out from within the smokescreen.

"Chaos, dame-Tsuna."

"Ciaossu, Tsuna-nii."

"Did you guys really have to blow up the window?" said Tsuna, staring at his former tutor and his sister in exasperation.

"It's not our fault your guards are so negligent in their duties," said Reborn flatly.

"They should've checked us for explosives before we entered the property," said Tsunade with a shrug.

"Did you even let them search you?" said Tsuna skeptically.

There was a brief pause before Tsunade and Reborn answered simultaneously, "No."

Tsuna sighed and picked up his overturned chair, wiping off the glass shards. "Well, you're here, even though I would've preferred it if you entered through the door like everyone else," he said, sitting down. "Let's hear your report."

"Zhao was a huge part of the current illegal weapon-dealing ring that is quickly spreading," said Tsunade. "Even so, he obviously wasn't one of the ringleaders, just a sort of 'middle man' to the dealings. He dealt to several countries, including Pakistan, China, the United States, Italy, France, and Iraq."

"That expands the range of the ring to about 38 countries," continued Reborn. "If this goes on, any minor riot could become lethal if everyone is armed with machine guns."

"Lucky for us, I managed to get the name of Zhao's boss out of him before he had to be—disposed of," said Tsunade, passing Tsuna the file. "His name is Rino Kanuki, head of the Rino Corporation. They deal in the international stock market and, according to Zhao, more illegal weaponry. I did some research and it turns out the he is conveniently staying in a hotel and casino not far from here."

Tsuna nodded seriously. "This Rino character probably is closer to the core of this operation and might help us get closer to the person in charge. According to our covert operatives, there have already been several operations planned by rogue groups using weapons acquired through this weapon-dealing ring. Most of them have been foiled, but we can only do so much before one operation succeeds. Let's see…"

He leaned forward and opened up his laptop that had miraculously survived the blast. "Ah, here we go," he said, clicking through a few files. "Tsunade, you will be Kanoki Mizuki, rich heiress to Puraisu Resu Jewelers. The company has allegedly been illegally smuggling priceless jewels and staging false robberies for insurance money, and both scams could use a few high powered fire arms."

"How about his personal body guards?" asked Reborn.

"I was just getting around to that," said Tsuna, sighing at how impatient Reborn was. "Seems like Rino-san is far from possessing clean morals. Though most of his men are hired thugs, the ones that need to be watched are all, well, female. Unlike Tsunade, their expertise lies less in direct combat and more in deadly seduction. Obviously this employment speaks volumes about Rino's character."

"I wonder if they take their payment in cash or in bed," muttered Tsunade darkly, openly voicing her opinion of hitman in that line of work. (A/N: Ok, just saying, this line made me laugh when I reread it xD.)

"Anyway, that's where Naniko Tomoko, young—and wealthy—owner of the grand Naniko Marketing Franchise," said Tsuna. "People like him are like candy to Rino's bodyguards, and once Reborn catches the attention of the three of them, they'll be buzzing around him light moths around a light. Go to Building 6 for wardrobe and any other materials for your cover ID's."

"Got it, dame-Tsuna," said Reborn. "One thing: you mind moving us to Building 3? We returned our old ID's before we came, and I think they're still in lock down because we shut down the security system."

Tsuna stared at them in disbelief for a second before shaking his head. "I don't even—never mind," he said wearily. "Fine, Building 3."

Just as Tsuna said it, a silver haired man with a cigarette dangling out of the corner of his mouth, burst into the room.

"Juudaime!" shouted Gokudera frantically. "Someone broke into Building 6 and I heard an explosion up here so I rushed over and—" Gokudera abruptly stopped talking to when he saw Tsunade.

'And this is why I didn't want you two to attract so much attention to yourselves,' thought Tsuna unhappily, observing the glares Gokudera was now sending Tsunade's way.

"You!" Gokudera yelled, pointing at Tsunade. "Why is the Black Rose brat here?"

Tsunade looked Gokudera up and down for a second before responding. "Oh, it's you, Baka-dera," she said coolly, using the name that she had picked up from Lambo the first time she was introduced to the guardians. "Need help with the accounting again?"

Gokudera bristled. "I should've known you were behind today's security breaches," he growled. "Though you're the Juudaime's sister, you're still nothing but trouble!"

Behind Gokudera, the door flew off its hinges, revealing two more unhappy guardians that were a bit more on the murderous side.

"I will bite you to death, brat," said Hibari, his aggressive stance radiating with murderous intent.

"Kufufufu, looks like today was a great day to return to Japan," said Mukuro, his murderous eyes glinting with malice.

'Why does everyone have a bone to pick with my sister?' thought Tsuna, slamming his head into his already beat-up desk. Gokudera was annoyed with her because she had caught a minor mistake in his accounting and embarrassed him during the biannual Vongola meeting, Hibari wanted to fight her because she had matched him in hand-to-hand combat 2 years ago and maybe would've beat him if Reborn hadn't dragged her off at the last minute, and Mukuro was pretty angry that Tsunade was able to look through his best illusions enough to laugh at him and land a blow.

And this wasn't even the most troubling bunch.

"I heard Tsunade-chan is here to the extreme!" shouted Ryohei, bursting into the room. Behind him were Kyoko, Haru (who both now worked in the Mafia for the Witness Relocation Program) and Chrome, all smiling happily.

"Our imouto is back in town!" squealed Haru happily.

"You haven't been getting hurt, have you?" asked Kyoko, worried.

"I've been working on new illusions, and I was hoping if you could tell me how real their auras looked," said Chrome softly.

"Let's go brawl to the extreme!" roared Ryohei.

Tsuna couldn't help but chuckle when he saw Tsunade's face pale a bit. Sure, she could handle violent people looking to pick a fight, but when it came to doting girls that saw her as an adorable little sister, well, let's just say last time she was alone with them ended up in several frilly dresses and thousands of dollars in damage.

The room was now filled with chatter as the guys argued who would battle first and the girls tried to get over to check on Tsunade. Usually, Yamamoto would be able to diffuse the situation, but he was currently picking up Lambo from school, leaving Tsuna to his own devices.

"You guys should probably get going," he whispered to Reborn and Tsunade.

Tsunade nodded vigorously. "I want to get back soon because somebody just had to fight me to prove he was right," she said, shooting a glare at her tutor. "Because of that, I didn't have any time to review my Arabic."

'Fight?' thought Tsuna, confused. It was then that he noticed the bandage on Reborn's face and the way Tsunade winced slightly whenever she moved. His jaw dropped open.

"You fought Reborn?!" he asked in astonishment. "And you actually managed to hit him?!"

"She has to beat me someday in order to become a true hitman," said Reborn with a smirk. "But as the bruise on her back shows, dame-Tsunade still has a long way to go."

"You don't have to rub it in," muttered Tsunade, gently touching the tip of her ear that was just starting to develop a scab. "Anyway, bye, Tsuna-nii, good luck with your guardians."

"Thanks," said Tsuna, a bit of affection for his sister bubbling up inside him. "Good luck on your mission, and with your training."

"Oh trust me," said Reborn, a devious grin on his face. "She'll need more than luck."

As the two hitman jumped out the same way they came, he could almost hear his sister thinking about how she'll need all the luck in the world to deal with even half of Reborn's training methods, and he felt bad for her. One year with Reborn was already hell, but ten whole years? It was impressive that Tsunade hadn't gone insane. Even so, she had earned the respect of all his guardians; they wouldn't fight just anyone if they didn't see them as an equal.

As bad as Tsunade had it, Tsuna had his own problems to deal with.

The volume in his office had already increased several decibels in the last few seconds, and tempers were running high. Tsuna began to tell them to calm down, but Gokudera had already snapped and lit a single stick of dynamite, throwing it before realizing what a bad idea it was.

A large explosion came from the office for a second time that day.

Tsuna looked up from his desk, relieved to see no one was hurt. In the doorway stood Yamamoto and Lambo, looking quite confused.

"Did I miss something?" asked Yamamoto.

A/N: That was fun~~. Next chapter DEFINITELY will be shorter. How do I know? Because I already wrote it xP. It was going to be part of this chapter, but the word count got WAYYY too high. You can expect it coming up later in the week~~. BIG THANKS to Lite Crystal27, and Drika-Veras for reviewing!

Read and Review guys!