Assassin assigned to assassinate the unkillable (A hxh and assclass crossover)

The Assignment

Killua Zoldyck was one of the famous assassins in the Zoldyck family. He belonged to the scariest family and was trained at a very young age to become an assassin. He has the blood of many unruly humans on his hands. He owns cold blooded eyes that could kill a man at one glance. His life was a living hell. So being assigned to kill the unkillable was not something out of the ordinary.

Well let's not get ahead of ourselves here and start from the beginning. It all began after a certain mission.

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As Killua jump from rooftop to rooftop, he was closer to his destination, his home, his hell, also known as kukuroo mountain. Home of the world's fearsome assassins.

He had just finished assassinating one of the politicians that supposedly betrayed the company president. To get his revenge, the president hired the Zoldyck's to kill the man for betraying his trust. The man supposedly used the money, that was suppose to profit the company, for his own selfish needs. The president was desperate enough to get his revenge, that he assigned assassins to kill his ex subordinate.

Silva, Killua's father gave him that simple task to handle, for it was not needed to send one of the more experienced assassins of the family to abolish the simple minded creature known as a human. The man had simply wanted power and of course, he had chosen the path of treachery. He let money control his actions, he could've chosen another path yet he chose this one. He was a brilliant man before money had gotten to his head. Becoming one of the politicians for the company president, had got into his head. Thinking that he was a much better suited man to lead the company into a better future. So he abused his power and stole the money that was sent to him to build another tower for the company's profit. He used that money to build his own company and went against his president. This was his downfall.

As he was exiting the building with two, well built, bodyguards, Killua jumped down from the rooftop of the 50 feet tall building. Of course he did flips on the way down to lessen the impact. While doing so he landed gracefully behind the man and was soon attacked by the two bodyguards, but their effort was futile. For Killua had stabbed them through their heart with his mutated hand that was currently equipped with sharp nails that could literally take a mans heart out its vessel in seconds.

There stood a boy no older than 12 surrounded with 3 dead men on the ground.

He soon left the crime scene with his hood up. As he walked down the alley way, he saw children playing with a soccer ball, that soon rolled to his feet. As he was about to pick it up, someone else got to it first.

He turned and saw, his brother, Illumi. He had accompanied him in his assassination. His purpose was to make sure Killua had done his job and followed his rules.

His brother still holding the soccer ball, had lectured him about the unnecessary friends that he wished he could have made. To prove his point, Illumi killed the kids in seconds in front of him.

Although Killua had begged for him not to kill them, He had killed them anyways. Killua knew he could not go against him, for if he tried, he would surely be punished until he was in the brink of death.

So instead of attempting to kill his brother, he turned around and walked away and soon jumped on top of a rooftop. He was in his way home or as it is called by him, hell.

He soon returned home, only to be greeted by his butler and maids awaiting his return. They were aligned beside the red carpet which led to the stairs.

He walked towards his father's 'office' to give him a briefing on what had lately happened. He soon arrived at his door and knocked. Once he heard a 'come in', he obeyed. He entered the room and was commanded to immediately report to him. And so, he obeyed, like the good puppy he is.

"Father I have terminated the target." Killua had said coldly to his father. Looking at his father for approval, and he did.
"Good." Silva replied, nodding with approval towards his son. "There is, however, another mission you have been assigned to. Only you can do it. For it requires you to be in a class with amateur assassins with the mission to kill their teacher. I assume that you have heard of the current state of the moon. That teacher of theirs was the one whom destroyed 70% of our moon. He currently has a bounty of 10 billion dollars  on his head. He is considered a monster. He cannot be killed with normal weapons. Once you arrive at your destination the government will provide you with specialized weapons to kill your target. I have heard that he looks like a large yellow octopus that can move at Mach 20. He has threatened the world of his existence. He will destroy the earth next year during March.  He gave the government a condition though, that he would teach class 3-E in a school called Kunugigaoka Junior High School. The government agreed, for they would have watch over him most of the day, but he was given the condition that he could not harm the students in any way. The students in 3-E are flunkies or misbehaved children. They are used as an example for the other students, for if they ever misbehave or not do their work, they will be dropped down to E class, also known as end class. Only the students in E class and the government have knowledge of the creature that potentially destroy the world as we know it. They were given the task of killing this creature to save the earth. There are currently 26 students in the class." Silva said in a monotonous voice as he handed Killua a folded filled with the information he was currently being briefed on. "You are to join this class and help them kill the creature. You will leave tomorrow morning at 5:30am to board the airplane to Japan. Gotoh will be accompanying you in this mission. He will be a teacher for this class, while also attempting to kill the monster. You are free to go." Silva announced to the young assassin, while doing a shooing motion with his hand towards the door.

With that Killua Zoldyck exited the room with a cold look in his eyes and a folder in hand. Although he did not look it, Killua was actually excited to leave the clutches of his home. Excited to be finally free and no one but his butler to confine him in a cage. Tomorrow will be the day he would be able to befriend other children.

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How did you like it?

Please excuse any mistakes while reading. This is my first book I actually put some work in.

All credits go to their rightful owners. I do not own these characters, this is only a fanfic.