TITLE: 殺せない

SUMMARY: A new teacher comes to Kunugigaoka junior high making a startling announcement, he is an assassin, and his target? All of E-class. However, he doesn't wish to simply kill them. A target should be worthy to be slain after all, so he instead trains them, and declares he will kill them when they're ready. But these kids have a lot more to worry about than the bounty on their heads.

Rated M.

Koro-sensei's First Lesson

"Not everyone is here," Terasaka growled from under his breath, he was still being stubborn but clearly the events from their previous class had shook him a bit so he wasn't about to be full on problematic.

Koro-sensei turned scanning the room with a frown, "Everyone is here who was here yesterday…"

"Tsk, shows what you know…"

Frowning slightly he checked the class list, and then he noticed. "Hhmm… Karma Akabane… Do any of you know where he is today?"

No one answered him.

"Gosh," Koro-sensei smiled awkwardly. "Did my threatening to kill you all put you off that much? Let's get you kids to warm up to me a bit."

He walked over to his bag and removed a few bags of candy. "Kids love candy right?" he said. "So, the people who answer my questions, will get chocolate. How about that?"

"Were not babies," Nakamura snapped crossing her legs as she rolled her eyes at him. "You can't bribe junior high kids with chocola—"

Isogai had raised his hand.

He turned to him smiling, "Yes?"

"Karma is a skipper, he rarely comes to class, and the few times he does he almost never stays the whole time…"

"Awesome information," Koro-sensei threw him a piece.

Nakamura glared at him angrily, and a bit sheepishly he held up the piece of chocolate smiling, "What? Kids love candy, and I want to take some home to my siblings…"

"Tsk," she turned away from him as though he had just betrayed the whole class.

He checked the class list again before looking up. "Nagisa," he turned to face him, "You live the closest to Karma, did you see him on your way to school today."

Nagisa shook his head, he seemed a bit embarrassed to be called out in front of everyone and he avoided eye contact with him choosing instead to look down at his desk.

"Nagisa doesn't talk," Nakamura pointed out. "He's too shy."

He stared at Nagisa for a second and then.

"Heads up," he said and Nagisa glanced his way just in time to catch a piece of candy he had thrown to him. "Great job answering my question."

All he did was shake his head, that wasn't really answering a question. Yet he had been rewarded for it… Nagisa was getting the feeling that this guy (with all the wanting to kill them aside), was probably going to be an easy grader if he was giving out treats for nothing. He stared at the candy for a moment.

"It's not poison or anything, you can eat it," Koro-sensei told him before returning to the rest of the class. Nagisa unwrapped the candy and put it in his mouth, still… He couldn't help but wonder how their teacher knew that he lived the closest to Karma…

"Oh hey... what's that?" Everyone turned in Nakamura's direction when she spoke up, she was staring at Nagisa with big eyes and a devilish grin. "Hey do you have a hickey?"

Nagisa's hand flew up immediately to his neck covering the mark on it. "Oh gosh you do! Who's the lucky girl?"

Everyone was staring at him, and Nagisa looked like he wanted to die he was so embarrassed.

"Nakamura," Koro-sensei said sternly.

"Okay sorry, lucky boy then," she teased.

And Nagisa's face flushed brighter and he pulled his sweater up a bit to hide it. A lot people in class began laughing and they suddenly heard a loud crack when Koro-sensei dropped his clipboard hard against the desk. He looked upset for the first time.

Everyone in class looked forward, and suddenly his expression softened and his smile was back. "You guys wanna hear the story about my boyfriend?"

The girls instantly squealed, and the boys looked rather uncomfortable. He sat on his desk cross legged and began recounting a heroic tale of when he and a guy had assassinated a foreign diplomat and the tale ended with the two of them making out on a rooftop. The girls were enthralled by the end hanging on his every word and most of the guys looked even more uncomfortable.

"Ugh, you know," Teraska gowned forcing a tone of boredom. "Telling us you're gay, makes you like, a thousand times less threatening…"

"Really?" Koro-sensei asked. "Well as I recall I kicked your ass yesterday, didn't I?"

Terasaka instantly looked angry, but he didn't seem upset enough to try and challenge him again.

"And I'm not gay," he pointed out. "I guess the correct term would be… bi… But I don't really like that label either. I just see romance as more open than most. You should give everyone a chance. If you resign yourself to only being able to love someone because of their gender, then you just cut your chances of finding your special someone in half. Add more restrictions to that, like saying I'll only date blondes, or people who are skinny, then you cut your chances down even more. And people sit around and wonder why they can't find the one…"

"Well, sure but if you're not attracted to them sexually because of their gender then how is that supposed to work?" Yada asked.

"Sex is quite literally the least important aspect of any relationship," Koro-sensei pointed out and many of the class' faces instantly looked disbelieving. "Well… it's quite a nice part of a relationship don't get me wrong. But if you base an entire relationship off of sex then trust me, you don't really love the person, you just love the feeling the person gives you. Let's say they got in an accident and their internal organs were all messed up and for their health you could never sleep with them again, would you dump them just over that?"

Everyone looked around awkwardly.

"So before you decide to be with anyone, ask yourself one question: If you could never be intimate with this person for the entirety of their life, if you could never kiss them, or touch them, would you still wish to be near them for the rest of your life? If you can't answer yes to that question, then your love isn't really for them."

"Uh Sir…" Fuwa raised her hand slightly. "Is that how you feel about your boyfriend?"

"Oh no," he answered and bluntly added. "We broke up a long time ago."

All the girls looked disappointed as they had clearly been expecting a better ending.

"But I did fall in love with a woman I met behind glass," he pointed out. "And I knew I loved her when I realized she would stay in my heart forever even if the glass separating us never broke..."

His gaze seemed far off then, as though he were reminiscing. They were all immediately interested again.

"What girl behind glass?"

"What's her name?"

"Are you with her now?"

"Alright, alright. I think we have gotten off topic enough," he explained. "Maybe I'll tell you her story someday, if you're all good. For now I have a whole bag of candy to give out in exchange for answers to my questions."

The rest of the class went on with him asking a question and giving out candy regardless of whether or not the answer was correct. As long as it was an honest answer, and as long as he could tell you tried. You got candy.

Nagisa was working through the latest math problem he had written up on the board when he suddenly stopped mid-equation. He hadn't realized right away, but he understood it now. Had his teacher really launched into a very personal story about his life leading into a borderline sex talk with a group of junior high kids, just to stop a student from teasing him?

He glanced up at him feeling slightly shocked, and then when their teacher's eyes met Nagisa's, he gave him a smile before turning back to the board.

When it was time for gym, they all got changed and realized that Koro-sensei would be teaching that as well.

"Where is our gym teacher?" Kataoka asked frowning slightly. She looked around frowning.

"I paid him off to take a hike for the rest of the year," he explained. "This class will now be spent teaching you how to be my equal."

"So you can kill us right?" Terasaka spat looking annoyed

"Right-O," he answered. "But look at it this way, if you are my equal, then you have a chance of surviving…"

"Hey that's true," Terasaka (for the first time today) looked happy. He picked a stick up off the ground. "Alright, so you're gonna teach us to fight then."

"Yes," he answered, "But not with that…"

He walked over to a duffle bag, unzipped the opening and poured the contents onto the ground. It was filled with rubber knives.

"You gotta be joking," Terasaka picked one up and bent back the blade to display just how flimsy it was. "These aren't going to hurt anybody."

"Exactly," Koro-senesei nodded. "We're not trying to hurt anybody… yet."

So the rest of that class he let them go around and pretend to stab one another, all the time watching…

"What is he doing?" Kimura asked frowning when he noticed he was just staring. Nagisa thought he knew, he was taking this time to see how skilled or unskilled they were already.

"Yo!"

They turned, he was talking to Nagisa, but everyone in class looked his way when he addressed him.

"Hi Karma," Nagisa answered looking up to him as he came strolling into the lesson as though he hadn't missed most of the day.

He glanced around, "Where is Little Mrs. Waterfalls?"

Waterfalls was a cruel nickname the class had given their former teacher, because they made her cry a lot.

"Gone," Yoshida laughed. "We got a new teacher now…"

Karma looked in the direction he pointed and grinned, when he turned his head he noticed a light but noticeable bruise on Karma's eye. Plus his lip looked slightly bigger than normal, as though it had gone down slightly from being swelled up.

"Don't mess with him though," Okuda said shakily. "He threatened to kill us…"

"Did he now?" Karma's grin widened and he walked over to him. "You know, threatening students is a pretty serious crime. Maybe I should report you to the school board."

"I mean, you're welcome to… I guess. If you want," he got to his feet. "But how about instead we have a match in any subject you choose. If you win, you can report me. If I win, you start coming to class, on time, every day…"

"Sure, why not," Karma answered. "Any match I choose?"

"Anything," he answered.

"What sort of things are you good at Sensei?"

"Killing," he answered without hesitation. "But I also like to eat."

"How about a fight then, fists only," he suggested.

"Uh, Karma, this guys is an assassin…" Nagisa tried to explain to him, but he was already taking off his jacket.

The teacher glanced towards Nagisa, it seems he does talk, at least when Karma's around.

"What would an assassin be doing here?" Karma asked smiling the sort of smile when you're watching one friend tell an obviously tall tale, and watching another one fall for it. He clearly didn't believe Koro-sensei was an assassin, but he didn't seem surprised that Nagisa believed it. "Think about it…"

He looked at the teacher and smiled, "Whenever you're ready, I'll let you make the first move."

"I think you should make the first one, if any bystanders were to be watching right now, it wouldn't look very good on me to throw the first punch…" Koro-sensei pointed out and he too took of his jacket.

"Alright then," and Karma launched attempting to hit him with his left hand, and then another. Koro-sensei was dodging very easily and it was starting to piss Karma off.

"Are you left handed?" Koro-sensei asked mid-fight.

"No," he snapped trying to move faster.

"Well then," their assassin teacher grabbed his left wrist mid punch and kept pulling him forward so he would lose balance he fell onto the ground. He rolled over in an attempt to get back up only Koro-sensei placed a foot on his chest (not harshly, just enough to pin him). "What happened to your right?"

Karma looked caught off guard, and Koro-sensei took a step back and held out his hand pulling Karma back to his feet. Before he grabbed his right hand moving each finger up and down, and it was obvious that Karma did his best to hide the pain from it.

"I don't think it's broken, but it sure is bruised pretty bad. Why did you choose a fist fight if you knew you were injured? That wasn't very smart..."

"I didn't notice!" he snapped trying to be tough.

"If you didn't notice, then why is their makeup covering it?" he asked. He licked his finger rubbing it across the back of his hand where it revealed black and blue skin.

"Pfffft, Karma's wearing makeup," Muramatsu snickered.

"Felt like getting dolled up this morning eh? Karma?" Yoshida asked grinning.

He shot them both death glares, and they instantly moved slightly closer to Terasaka who was the leader of their little group thus they felt safer cowering near him.

"Alright class, I won. So you all go back to playing," he said and with a hand on Karma's shoulder he led him away.

"I didn't lose, you're supposed to fight until someone is unconscious," Karma snapped even as Koro-sensei bandaged his hand.

"I knocked you to the ground," he stated simply. "That's a win, don't be a sore loser…"

Karma glared at him, he didn't like this stupid teacher already.

"So, what happened to your hand?" he asked. Now that

"Like you care… stop rubbing it in my face."

"Are you mad at the fact that I beat you in front of your entire class?" he asked smiling.

"I already told you, you didn't beat me because I'm still conscious," he snapped. "And don't try to belittle me, in a real fight I would have—"

"Died."

"What?"

"If we had been fighting a real fight, you would have died. Your classmates weren't lying when they told you I was an assassin, if you had come to class on the first day you would have known," he explained as he re-packed the first aid kit he had taken out to bandage Karma's hand. "That's an impact wound on your hand. So I'm guessing it got squished under something, or you punched something out of anger. Or maybe you were aiming for someone and missed. Regardless, it's quite obvious that you don't know how to fight at least not formally… I want to kill your class because of the reward I'll receive. However, I don't want to just up and murder a bunch of children. So if you start taking this class seriously, I'll teach you how to fight, properly. Then who knows, when I do decide you're all ready to kill maybe you won't die so easily…"

"…" Is he really serious? Maybe his class hadn't been pulling his leg. There was something about the guys eyes, that if you stared long enough, they just screamed killer. His face was a different story. It was happy and cheerful, he looked like a murder's eyes had been photoshopped over the face of a happy youth on his wedding day. But that was clearly a facade.

Karma suddenly eyed him with much more seriousness than he had shown previously.

"What's with that look, I don't think I've ever seen a child look so hateful," he teased grinning at him.

Karma got to his feet putting his hands in his pocket as he headed toward the door. He paused just before walking out.

"People in glass houses shouldn't throw stones sensei," Karma answered without looking at him. "I don't think I've ever met a teacher who looked at his students with colder eyes than yours..."

He eyed the doorway for a few moments after Karma disappeared through it. He was a sharp kid, Koro-sensei had to give him that. Still, he knew he would have to be careful around him. One slip up, and that kid could learn to love killing just as much as he does…

"Wow Karma, is that first fight you ever lost?" Yoshida teased.

"Shut up," Karma answered frowning, he noticed the remaining pile of rubber knives. "So… what are we doing with these anyway?"

"Pretending to stab each other," Kurahashi answered. "It's actually kind of fun. It's like tag, but with knives. I kinda like our new teacher, even if he is an assassin."

"Assassin or not the guys an idiot, what sort of fool teaches his targets to fight back before he kills them," Terasaka asked frowning up at the equipment shed, Koro-sensei hadn't yet left it.

"It's counterproductive," Okuda pointed out, with a small frown on her face.

"Oh I don't think so…" Karma said. "Don't you guys get it? He's the cat, and we're the mice. Cats enjoy the hunt, why would he go after mice that are weak and can barely move when he could go after mice that run and squirm and squeak when he bites them? That sort of kill is much more fun and satisfying for the cat. So yeah… I can see it."

"Couldn't have said it better myself," Koro-sensei exclaimed from behind Karma throwing an arm around his shoulder. "Coincidentally, you should always beware of any cat that only goes after weak & injured mice. They're the worst…"

The class stared at him for a few seconds, and their minds finally registered that he was there.

"Wait a minute, where did you come from. You never left the shed we would have heard you coming!" Muramatsu snapped.

"Well, something tells me you kids need to be more observant…" he mocked before walking out before all of them. "So now, that you've proven how very unskilled you all are. Let's begin by showing you some proper techniques."

He closed his eyes spinning childishly in a circle and pointed stopping on Yada who looked a little taken aback when she was singled out. "Alright, you're up."

She walked forward shyly.

"Go ahead and drop the knife, you won't need it right now," he explained, and she did. "Now, pretend to throw a punch at me, just do it slow so the class can see what I do."

She did, aiming for his face, and he just as slowly reached out and grabbed her wrist.

"Alright, so say you have a chance of getting ahold of your opponent like this," he explained. "What should you do?"

"Push them away!"

"Twist their arm around behind their back."

"Push their wrist up and punch them in the gut."

"Uh, all possibilities," Koro-sensei said. "But lets say I push her back. Unless she has extremely slow reaction time…"

He slowly started pushing her backwards and she sent the foot which had been extended forward for the punch back to brace her stance. "She'll do just what she did, and if the opponent is far bigger than you, it'll be difficult to keep pushing her back. Not to mention by this point she is well aware that you're pushing her away. But…"

He told her to start throwing the punch again, and slowly he walked the students through his actions, "…what if I pull her towards me. It's unexpected, her momentum is already heading that way, and because it takes little to no time to do it, they'll almost always fall…"

He had brought her forward as they were talking and when she was brought forward enough to fall, he grabbed the back of her shirt and slowly lowered her to the ground.

"If you recall, it worked great with Karma a few minutes ago…"

Nagisa stared up at him. That's right… He had used it on Karma, and Karma's frown deepened. He didn't look embarrassed, but rather, annoyed.

They practiced moves on each other the rest of gym class, learning both how to unbalance someone and also how to throw someone twice your size over your back.

To prove that anyone could do it, he had Nagisa (who was the smallest boy in class), throw Terasaka (who was the biggest). Surprisingly, after listening to their teacher's instructions, he did it easily.

It wasn't so much about strength but how you throw them. Using math angles, the science behind gravity, and doing something he called uprooting a person's center. You could flip just about anyone over your shoulder, though he admitted, it might not work so well if your opponent were the size of a sumo wrestler. But someone of even above average build could be flipped with relative ease, even if you weren't physically that strong.

Which was good for Nagisa, because when it came to brute strength, he was pretty sure most if not all of the girls in his class could take him in an arm wrestling contest.

But he later realized this was bad for him too. He was considering the move over and over in his head while he waited outside the restaurant where his Mother worked. She was getting out late tonight, and she had asked him to escort her home on nights she worked late for safety reasons.

He was playing the motion over in his head, how he had to stand, the angle and speed with which he had to turn his body to get the right momentum to do the flip. When his classmate grabbed his shoulder, he practiced the move exactly how he was taught, and threw them over his shoulder only… Though he had been imagining one of his classmates, but it wasn't his classmate that he threw. It had been his Mother's boss, and he hadn't realized...

"NAGISA!" his mother snapped rushing over to the older gentlemen who was yelling in pain. Nagisa and his mother both apologized profusely, but… she got fired anyway…

The walk home was nearly unbearable, as Nagisa was certain his mother was waiting to blow up at him. Sure enough, their apartment door clicked closed.

"Damn it Nagisa! What the hell are we supposed to do now!?" she snapped. "I can't afford this apartment, food, and paying off your Father's debt! What are we supposed to do now Nagisa!"

"…" he choose not to say anything. It was his fault after all, and nothing he did would make it better.

"UGH!" she stormed over grabbing him by his hair she pushed him up against the wall with quite a bit of force, and he felt an instant sharp pain where his head hit the coat hook on the wall. "What are we supposed to do if he makes us pay his medical bills? We're going to be homeless, don't you even care!"

"…"

She gave him a shove towards the stairs.

"Go to bed Nagisa!" she snapped. "I have to figure out how to fix your mistake! I have to fix everyone's mistakes! Yours, your Father's!"

She stormed off towards her room, and he slowly headed up stairs. What we're they going to do. He went into the bathroom and looked at his forehead. It wasn't as bad as it felt. Just a small cut.

He cleaned it and went to do his homework.

Karma was the only one absent the following day, and Koro-sensei sighed when he read his name with no answer. "I was hoping after winning against him fair and square he wouldn't skip like he promised. Oh well… For today's lesson—"

He paused. Nagisa had raised his hand. Knowing how shy he was to speak in large groups, Koro-sensei knew immediately that this had to be important.

"Yes?" he inquired, and Nagisa nervously put his hand down.

"Karma doesn't break promises Sir…"

"What do you mean?"

"Karma doesn't break promises, and he doesn't go back on deals…"

It looked like it was costing him a lot to say it, and he avoided looking him in the eyes the whole time. Koro-sensei picked up his meaning. He was trying to tell him, that if he wasn't here, he had a very good reason…

"Children, today is a free day. Study and practice whatever you wish, and the homework that was due today, will now be due tomorrow," he explained. There were some cheers from the people who hadn't done their homework.

Then, he turned on his heel and left class without even the slightest look back.

"Well, if the teacher isn't staying," Nakamura said as she threw her bag over her shoulder and walked out as well.

Rinka and Hayami glanced at one another and got up too, Hayami pulled out a cigarette for each of them as they left.

"Well, shit, if everyone else is leaving," Terasaka and his gain got up too.

One by one, they left. Until Nagisa was the only one sitting in their classroom. He reached over grabbing his bag before he walked to the door. He hoped Karma was okay... If their was any good quality that Karma possessed, it was that he kept his promises. So... if he wasn't here...

So, yes. Kayano and Itona will be coming in later. Not sure if Ritsu will be in this at all, at least... I Haven't figured out how to incorporate her yet. So unless I can she probably won't be in it...

*bows* My apologies to all the Ritsu fans...