(A/N)THANK YOU ALL SO MUCH FOR REVIEWING! IF YOU ARE READING THIS THEN IT MEANS I GOT MY HANDS ON SOME WIFI. I WILL TRY TO GET THE 5TH CHAPTER READY FOR YALL. AND NOW WITHOUT FURTHER ADUE, HERE THE 4TH CHAPTER OF THE HUNTER ASSASSIN'S *blows horn dramatically*

It was obvious that Kurasuma was angry about the new students arrival, so much so that he was trembling in rage and chipped off the end of the chalk as he introduced her to the class

"Kukukukuku" Koro-Sensei chuckled as he watched Kurasuma boil in rage.

"It's be best for you not to laugh, this is a serious matter! The AIFA is apart of the foreign exchange program, she will be trying to kill Koro-Sensei like everyone else. And as for our agreement it will be the same as it is for the other students, no fighting back and no harming her in anyway. The agreement we have still applies." Kurasuma finished.

"I see, well in my personal opinion you and the government take that agreement a bit too literally, but oh well." Koro-Sensei stated as he welcomed AIFA to the class then continued to start the lesson while the other students began whispering to the neighbors, including Killua and Gon who were ecstatic about the new arrival, talking amongst themselves, questioning whether or not it would attack soon.

Not even ten minutes into the lesson, smack posted out of the box as the box pulls out its weapons and immediately begins rapid fire against Koro-Sensei who immediately dodged it as bullets ricocheted off the walls and hit the students while Kurasuma and Professor Bitch watched in horror.

Killua immediately took action and moved over to Alluka's seat as fast as he could, leaving a dust trail behind him as he immediately shielded her with his body. Luckily, Gon had been quick enough to get under his desk and shield himself from the bullets that filled the room. After a few seconds, the bullets stopped and the class immediately emerged from their desks.

"Oi, Oi, Oi! What the hell was that?!" Killua shouted as he started to stomp his way over to AIFA. "You could've poked my sisters eye out, what the hell were you thinking?!" Killua shouted at the box as he shook his fist in front of the screen.

"I have to agree with Killua here, out of concern out of someone shooting their eye out, I'm afraid the use of firearms in this class are strictly prohibited." Koro-Sensei responded.

"Understood the next round of fire will be aimed more carefully" She said as numbers and codes immediately showed up on her screen, recalculating the next round that was about to be loaded upon the students.

"Tsk, tsk, stubborn…aren't we?" Koro-Sensei said as the box opened fire again and in the blink of an eye Killua was next to Alluka's side and shielded her again from the barrage of bullets.

Koro-Sensei began teasing the machine, but all of that stopped when the machine blasted his hands to bits and the class was overcome by overwhelming shock.

"Left fingertip destroyed, newly added second gun was effective." The box said as it put away it's guns away and immediately started to recalculate. "Probability of neutralizing target in the third attack is less than 0.001 percent, probability of neutralizing target in the fourth attack is 0.003 percent, probability of neutralizing target before graduation is at a minimum of at least 90 percent. Be advised, the third attack is commencing now." The box spoke as it immediately drew it's weapon and began to fire on Koro-Sensei once again.

An overwhelming blood luster overcame the classroom, so powerful that it had even the great Kurasuma and Koro-Sensei all shaken up about it. All of it had been coming from one person, the white haired boy who sat in the back of the classroom. It was the most terrifying thing the students had ever experienced up till then. The only reason it stopped was because on one thing.

"Onii-san!" yelled Alluka as she bonked her other brother on the head. "Stop doing that or you won't get any friends!" She complained as she sat down in her desk.

"Sorry Alluka, I'm just upset about some things," Killua responded shyly as he turned over to Alluka

"Killua you know we just can't go around scaring people like that" Gon said sternly.

"I know, it's just Alluka almost got hurt today!" Killua protested as he pointed to the box.

"I know you're angry Kil, but there's no reason to be so upset. She is programmed to do this, it's not like it is her fault" Interrupted Koro-Sensei as he patted Killua on the head.

"But you don't understand!" Killua shouted as he stood up and slapped Koro-Sensei's tentacle back.

"I understand enough that you have no right to frighten the students the way you did." Koro-Sensei retorted as his face turned red. "Now if you continue this behavior I will have no choice but give you detention, is that understand?"

"Tch, yes sir" Killua responded as he sat back down with his arms crossed.

"Good, now everyone if you don't mind, will you all clean up this mess while I talk to Kurasuma? It's rather important "

The class agreed to clean up the mess while Koro-Sensei went to go talk to Kurasuma I'm the teachers lounge and the students began to talk amongst themselves.

"Who knew Killua could be so….scary"

"I know right, it's like he's not even human"

"I wonder if Alluka and Gon are that scary"

Most of the students were talking about Killua but none dare to approach him, all except two, Nagisa and Karma.

"Hey, Killua" Karma said as he and Nagisa walked up to Killua as if nothing happened.

"What do you idiots want?" Killua rudely asked as he glared at the two students.

"W-Well, we were wondering if you could help us with our next assassination attempt on Koro-Sensei." Nagisa said as he pulled out his notebook that was full of notes on Koro-Sensei. "We've been collecting notes of Koro-Sensei's weaknesses and we think with your speed, we can actually do okay this time."

"No thanks" Killua said calmly as he got up out of his desk and headed over to Gon and Alluka.

"But why? I mean, it's obvious you're really strong, so why do you let it go to waste?" Karma said comply as he crossed his arms.

"I have my reasons , you have yours" Killua replied as he made his way over to where his friend and sister were. The all three left the classroom shortly after the final bell rang and headed down to the Nurses office.

OKAY EVERYONE THAT'S GOING TO BE IT FOR THIS CHAPTER, IM SORRY IT WAS A B IT RUSHED BUT AS I POST THIS I AM LITERALLY GOING TO BE G ONE AND THE REST NO WIFI AND I PROBABLY WONT HAVE WIFI FOR A MONTHS OR SO. SO, I HOPE YALL UNDER STAND IF I WONT POST UNTIL SEPTEMBER.

PLEASE REVIEW!