Summary: Tsuna learned of his uncle's secret job when the teen visited him. Not only did his uncle's boss seems interested in him because of his 'classified' files, but Tsuna also caught the attention of the god of mischief? Uh, uh, and now, he must save his uncle from the said god with help of the superheroes? Really, Tsuna only wants a vacation.

AN: This is my first time doing movie fanfiction. Unlike anime/manga that I can re-watch/re-read anytime, I don't watch movies too much. So, yeah, don't hope too much on this story.

AN 2: This story is little AU on KHR part; like Tsuna was introduced to the underworld early, Nana knew about the mafia, etc.

Chapter 1 - Change of the Plan

Venice, Italy

06:22 AM

*Glare*

Sign

*Glare*

Sign

*Glare*

Burn

This was what Tsuna had been doing for the past 2 hours after the paperwork had arrived. If he had known that he will have to sign thousands of paperwork per day, then he would have put more effort into denying the position of the boss. But of course, with the best, sadistic, evil hitman as your tutor, that would be impossible.

A sigh escaped from the brunet lips every once in a while as he scratched furiously away at the pile of work with his ballpoint pen, an occasional shuffling of the papers breaking the silence.

From a young age, Tsuna was taken from his homeland, Japan, to learn his duties as one of the Vongola candidates to be the next boss in Italy when he was still 8 years old. He would occasionally go to Japan to visit his mother, Nana who knows about the mafia (Iemitsu wasn't too much jerk, and decided to tell his wife about his job after they married). Back to Japan a few years later, Tsuna spent his middle and high school in there (where he got to know some of his guardians) and returned to Italy after graduating at the age of 15 (he skipped a few grades).

Sawada Tsunayoshi had already accepted his fate(s). Accepted his position as the next boss of Vongola and the heir of Arsella Corporations.

Vongola is the most powerful Mafia family in Italy. The Vongola is one of the, if not the, largest Famiglia in existence, having an extremely large following. The Vongola is unique in its structure in that it accepts other Famiglias to become a part of their power, and, as such, has other Famiglias beneath them. The Vongola originally started as a vigilante organization, but their ways gradually changed during the second boss reign, eventually leading to violence and crime. The influence of the Vongola is worldwide, and it was said that no Famiglia can match them in terms of size, tradition, rules, or power. Due to this, the boss of the Vongola is considered by many to be the capo di tutti capi, lit. "boss of all bosses". The family has been around for nine generations, these generations have gone through many wars and bloodshed.

One and half years ago on his sixteenth birthday, it was officially announced that he would be the next boss by his grandfather figure, Timoteo, the ninth boss of Vongola. But it's not like he took a position willingly. But, after all the candidates were killed, and the one who was alive is unfortunately not of Nono's blood, he, as the great-great-great-great grandson of Vongola Primo and therefore a candidate for the next boss. After a lot of denials and solved some problems (and wars), Sawada Tsunayoshi will become the Vongola Decimo when he is 19 years old, in the next 2 years. The Vongola family had grown quite a bit under Tsuna, and he hadn't even taken control yet. The brunet was powerful, that much was undeniable.

Arsella was one of the largest and famous companies in the world. It was always on the top of popular brands; sports, electronics, clothing, and etc. They are based (main headquarters) in Italy and have several branches (small companies and stores) in various countries. But of course, nobody (except the family and closest allies) know that those were all undercover company for the Vongola Famiglia. Arsella Corporation is a 'light' version of Vongola. If Vongola is a secret organization in the underworld, Arsella is a 'normal' company in the civilian/public world. Like the Vongola, Arsella Corporation was founded by Giotto. They almost disappeared in the fifth and sixth generations, but fortunately, they were able to rise again in the next generation and the company was getting bigger and more global. Timoteo still the president of Arsella, but even so, Tsuna cannot run away from his duties as the heir of the company.

Reborn (who was his tutor since his childhood) still tortu- tutoring and train him about various things; fights, diplomatic, etc. That was the problem, with the two occupations, the brunet got more paperwork every-single-day!

Sawada Tsunayoshi was tired of paperwork. He really wants to take a break; sleep, change the atmosphere, he needed a vacation! Take a break from all kinds of craziness caused by his family and allies, more precisely his Guardians and Varia.

Luckily that day, his fellow boss proposed a plan. And without thinking too long, the Vongola Decimo agreed.

(You can read 'New Assistant: Departure of the Skies' for this. The 'plan' is somehow the same)

It has been decided.

It has been decided that they; the Vongola, Simon, Giglio Nero, Gesso bosses and the Varia's leader would take a vacation (run away), it was Byakuran's idea and the rest of them still came along with that (stupid) plan. When the white-haired man explained the location they were going to go to; Japan, it's not bad. It has been a year (more or least) since the brunet moved to Italy, maybe he will secretly visit his mom?

But, when the famous Vongola's Hyper Intuition told him something else, Tsuna paused to think for a moment.

So, when the black portal appeared, Sawada Tsunayoshi finally decided something.

Being the last person to enter the portal (his fellow bosses have gone to their respective destinations), the brunet stopped and stared at the Vindice's boss. "Bermuda, I have a request." The silence of the older boss indicated that he was listening, so Tsuna continued "I wish to change my destination."

Missouri, USA

12:48 AM

Clint Barton was freaking out. And that's putting it lightly. When his wife had called him some minutes ago, he thought he would faint on the spot as his heart threatened to jump out of his chest. Laura said there was someone who knocked on the front door of his house, it wasn't bad, right? No, if it's in the middle of the night and their home should be a 'safe house'. Nobody knows about his house and family, only a few know including Fury and Natasha, and they will contact him first for sure.

So who is the uninvited guest at his house?

He was very scared if they were his or SHIELD's enemies.

Luckily, that night the archer was doing a mission in the Cuba area, so after 15 (more or least) minutes of fast and crazy driving (thank God it's the night!), he's finally arrived in the familiar farm.

After stowed his motorbike, Clint ran to his house with dread at every step.

It's silent, too silent...

Has the uninvited guest left? Or perhaps... have they been forced in?

He felt fear for his wife and children. Laura... Cooper... Lila...

"Laura! Laura!" banging on the door hard, Clint kept calling while he prepared his daggers and gun just in case. A few seconds a familiar brown-haired woman opened the door. He hugged her, "Thank God you're alright!" give his wife a quick scan "Are children okay too?" confirmed her nod, Clint sighed in relief. "The uninvited 'guests' have left then?"

"Not..really."

Alarmed, the archer stare his wife's eyes. "What do you mean?!" he asked more urgently.

The brown-haired woman ushered her husband to come in. Then Clint felt another presence in the room.

There...

Currently, in the sitting room, someone was curled, sitting on the long sofa as the fireplace blazing, filling the room with the warm colors of orange. The person, it seems a male, with the back turned toward him so Clint can't look the person's face. Ignoring the quiet don't from his wife and her horror expression (why?), Clint took out his gun and pointed at their guest, "Who are you?!" with that shout, the person quickly turned toward him and Clint can't help to let out a small gap.

A teenage boy stood before him, in a semi-formal black suit with an orange necktie (why's suit?), with his back straight but shoulders slouched, looking perfectly at ease. Gravity-defying brown hair boobed as he shifted slightly. Warm brown eyes and bright smile adorning his face when he saw Clint. The teen frowned at the gun pointed at him, smirking he said to Clint who stood still stunned, "Is this the way you greet after five years we haven't met, eh, Uncle Clint?"

Stared at the teen, Clint slowly lowered his gun. His mind went blank for the moment before he yelled, "Tsunayoshi?!"

~Owari~

I like to write a cliffhanger, hehe XD (but, dislike cliffhanger as the reader)

Note:

- Vongola main HQ is in Sicily, but the tenth generation currently lives in Venice (one of Vongola mansion)

- Arsella is another name of Vongola, Italian from 'Clam'

- The difference in time between Italy and the USA is 6 hours

Please note this, I can write KHR fic just fine, but for Avengers fic this is my first time and I study later. So, if I made a mistake in the Avengers part or somewhere, feel free to correct me.

My friend asked: Are you a fan of Avengers?

The answer is 'not really'. I like to watch Avengers movies (and some of other Marvel movies) and its anime version, but only that. I don't collect their stuff like; shirt, figures, posters, and other like that.

So, yeah...

I have questions about the age of Avengers (please answer if you know and have time)

Clint -

Clint's family -

Other Avengers -

Fury -

Loki -

If not, I will make up them myself

Tsuna will be 17, you can guess how old the others from KHR

This fanfic begins at the same timeline as Avengers movie 1 (2012)

See you again in the next update ~