In this chapter I'll focus more on one of the teachers! Next chapter a main OC will be introduced (He still won't overshadow Haruka, don't worry) So for now please enjoy! More OC's (or all) introduced this chapter as well!

Disclaimer: The whole system with E-Class and unkillable teacher is not owned by me, rather inspired by the manga and anime Assassination Classroom. None of the characters that you see here is mine, they all own to their respective owners, including all the OC's.

"I'm sure both the ministry of defense and the S.A.T has already informed you, but starting today we will have one of the B class teachers transfer to the E class," Ryuya informed the principal, who had his back turned towards him, "The students needs the mental and physical support, of course I will be there as well. Don't worry however, I do have a teaching license. Is there any problems with that?"

"By B class teacher, it must mean the foreign language teacher, right? Abbandonato-sensei, wasn't it? Such a shame, the students grades had been considerably better after he came to learn here, but do as you please. Do remember that the students education and safety comes first."

"... Then, if you will excuse us."

"I'll have you know, accepting the job comes with the fact that you have the make the students able to lay their trust on you. That they don't have to feel fear when you're close," Ryuya said as the two male walked up the road to the worn down building where the E-Class were kept.

"..." Kyosuke Abbandonato glanced up at Ryuya, "Then wouldn't I be the worst candidate to take this job?" he said, ocean blue eyes narrowing slightly, slicking his short golden brown hair back as he kept his leather bag close to his side, "In worst case scenario, yes. Since you prefer not to talk at all. However, you already know more than half of the students at E-Class don't you?" Ryuya stopped in his tracks, turning around to face the teacher who also stopped, brows furrowed and a glare directed right towards him, "You're also known for your stealth, being called 'The Shadow of the Underground' as far as I've heard. You already have a small bond towards the students and your stealth will come in handy if they ever plan a sneak assassination on the target."

Kyosuke kept his glare on the orange haired male, who looked back with a stoic look. Taking a deep breath, Kyosuke passed Ryuya without giving him a side glance, "I already know how to treat students. I've been a teacher for two years, so of course I know what I'm going to teach. Oh and for your information as well..." Kyosuke glanced back, "I don't like anyone prying into my personal background, keep that in mind the next time you ask one of them about me."

Kyosuke had walked quite far from the orange haired male. Only when he glanced back and made sure no one followed him did he slap himself on the forehead, groaning "Great, colleague or not, I'm still a jerk to everyone that talks to me," he muttered, breathing out a sigh as his fingertips grazed the scar that ran down the right side of his face while his other hand gripped the cross he had around his neck. When he saw the building come in sight, he took a deep breath to calm himself before he stood outside the building and waited for Ryuya to catch up.

Meanwhile, he started to dust the nonexistent dust on his uniform, which usually consisted of a black business suits and shirt, though the first three buttons where unbuttoned, revealing the cross he had gripped a few minutes earlier.

When Ryuya spotted him outside, he quirked an eyebrow to as why he was there and not inside, "Figured it would be better to let you introduce me than me just waltzing in there and saying I'll take over his language lessons," he explained and Ryuya only gave a confused nod.

"Alright then, follow me."

The moment Kyosuke entered the classroom did all the talking stop, at the corner of his eyes he saw one of the male students, Tatsumi Nakagawa put down his 3DS, his face slightly twisting in disgust at seeing him, shiny blue eyes portraying the irritation behind his nerdy glasses. Kyosuke looked at him for a second before he remembered who he was. Ah, that's right. I used to teach him before. Think he ended up hating me after I took away his game console for the day. Though he did get one of the best grades in English, shame that he ended up here, but I guess that happens if you slack off at this school. Of course he didn't voice that out loud.

After Ryuya had introduced himself and said that he was going to become to Class' P.E teacher, he directed his gaze towards Kyosuke, who only sighed before bowing down slightly, "Pleasure to meet all of you once again. As all of you already probably know, I was once Class B's teacher, but under circumstances that the world is in, I've transferred to Class E. I know some of you already, like that one blue haired male that has to put away his 3DS before I confiscate it again... And If I remember, there were a few of you who were a part of Class C last year, the class I taught-"

"Ah, it's Kyo-sensei! The trustworthy but sharp tongued helper!" Kyosuke's eye twitched, turning towards the voice, where Hiro Arclight, one of the oldest ones in Class yelled in glee, his curly red hair bouncing as he sprang up from his seat, "Signor Hiro, sit down again," he said sharply, And then it was Hiro Arclight. Quite an... Interesting attitude that one has, almost like his whole mind is a video game. There were times when he would suddenly shout that he was the 'Main protagonist' in the middle of class, quite bothersome, but manageable. Again, not voiced out loud.

"But why is Kyosuke-sensei here?" Akira asked the two men curiously. Oh that's right, I haven't mentioned about my line of work.

"To put it simply, I'm a hitman," he said calmly, the students eyes widened in disbelief, before a chorus of questions came barreling at him, "Calm down so I can explain!" he snapped, hitting himself inside the mind for being a bit too harsh. The students quieted down, knowing to not anger the teacher, who they just got to know is a hitman any more then they should, "I don't like discussing about this, but I am indeed a hitman. Killed my first person when I was thirteen. The hitman part was kept a secret to all the students, but seeing as I'm teaching a class that will soon be professional hitmens, I don't see why I should keep this a secret. I'll teach you both in foreign language, our primary language being English and help Hyuga at his P.E lessons. I hope there's no complaints?" he asked, and when the class shook their head he nodded.

"Hah, another annoying teacher has come," Kyosuke's ears perked when he heard that voice, when he turned towards the source, he found Hibiki Nagamine, staring up at him with a cold glare, Ah, Hibiki Nagamine. Creates a mask to cover his real self, don't know the reason, but it has probably something to do with his former class. But I'm sure he's fond of kids, seeing that I saw him once playing with one at the playground when I passed by. This class sure has all the... Unique kids gathered.

Kyosuke then looked to his side, behind Ryuya was the yellow unidentified creature that threatened to blow up the Earth in no less than a year, "So you're the one... And your name...?"

"We call him Korosenai-sensei, seeing that he is unkillable. If you want the shorter version, it's either Koro-sensei or Koro-Koro," Otoya answered before the teacher could answer it himself.

Koro-Koro?

Kyosuke took a good look at the teacher, eyeing him up and down, What a weird creature, the only information I got so far is that the color of his face change according to what mood he's in or what kind of answer you give. "Speed of Mach 21, am I right?"

"That's correct, sir!" Kyosuke's expression remained indifferent as the teacher made a correct face, "Hm, not looking like a human could make it easier for me to kill you," he said, voice sharp and cold, sending a shiver down the students spine, "How rude! I'll tell you that I was both born and raised on Earth!"

"Yet you don't look like a human... Yeah. I'll probably feel no remorse about this," Kyosuke said, before facing towards the students, "As of today I'll be your foreign languages teacher, take care of me," he said before exiting the classroom.

Haruka walked down the corridor to her classroom, having just taken a trip to the toilet. When she looked up she was met with a familiar face, "Ah, Kyosuke-sensei, what brings you here?"

Kyosuke immediately felt his shoulders tense, eyes narrowing at the redhead, he answered with a calm voice, "Starting today, I'll teach here as well in foreign languages as well as helping you with the assassinations," he said, and Haruka nodded with a smile, "That's great! Getting extra help will be helpful!"

Haruka Nanami...

I taught her last year when she was in Class C. Her presence, no her whole self was extraordinary. On the outside she doesn't look like she could even harm a single fly. However, behind that smile of hers, hides such a big blood lust that she doesn't even know exists. Should I really train someone like her to kill? To bring her into the world where you can fin someone sinning in every corner?

"By the way, Kyosuke-sensei. The fact that you're here, then you must be someone influential on killing, right?" Haruka asked, Kyosuke's eyes slightly widened, before they returned to their usual hard stare. I haven't even told her that, "How did you know?"

Haruka smiled softly at her teacher, "After all, a normal teacher with no killing experience coming here is unheard of," she said before passing him, "Looking forward to be able to be taught by you again, Kyosuke-sensei! Your lessons were really easy to understand!"

"You're not starting now?" Ryuya asked as the two male sat in the teachers faculty, "No. I would like to gather information about him before I attack. After all, by merely looking at his movements long enough will be enough for me-" Ryuya blinked as the man in front of him disappeared, only then did he feel a presence behind him, "To kill him."

Kyosuke looked down coldly at the male, "They didn't name me 'The Shadow of the Underground' for no reason, Hyuga. I leave no marks or trace in my killings, who knows, if you find him dead on the ground one day, you may not even know it was me. I leave zero evidence behind, remember that."

Hyuga sighed, letting out a small chuckle as he glanced at the teacher who was heading out the door, no bloodlust evident in his eyes like the one he felt creeping up his skin a few seconds ago. We're really picking monsters to kill a monster in this world crisis, aren't we?

So... Out of many characters I find Kyosuke a bit hard to... Well, write about. He's a very well written character, not bad at all! Just a lot of thinking on how he would act in certain scenarios. So, HiroshitheHawk please do tell me if I portrayed him wrong, I'll do my best to write him better the next time he appears!

Kyosuke is one of the teachers by the way ~ More badass teachers coming your way soon!

Next chapter a major OC will be introduced, so look forward to that!

OC's introduced this chapter:

Kyosuke Abbandonato [Male] - Belongs to HiroshitheHawk

Tatsumi Nakagawa [Male] - Belongs to Spark Envoy

Hiro Arclight [Male] - Belongs to lVergill

Hibiki Nagamine [Male] - Belongs to Alex The God Killer