Assassination Classroom fanfic

Warning : Fem!Nagisa, AU (altough almost same with the anime)

Pairing : Karma x Fem!Nagisa

Rating: T

Disclaimer : I DO NOT own asssassination classroom and this fanfiction pure come from the anime and my head.

This is my first fanfiction and english is not my main language. If there any grammatical error, Forgive me...

I have inspiration to make this fanfiction after read 'Hidden Thruths by ninjapanda16' and 'Assassination classroom: Different way by ImWritingPeper', I love both stories so much.

"conversation"

'tought'

flashback

"Foreign language"

Chapter 1 : My homeroom teacher is an octopus?!

The class filed with silence, nobody move form their spot. Altough, they're seems nerveous because of something, in the hall you can hear a slithery sound. And then the classroom door opened... you can see a giant yellow octopus walk into the teacher desk and put the roll book on the teacher desk.

"Now, let's begin the homeroom. Student on duty, on your command," he said, with the never ending smile that plastered in his face.

"S-stand up," said a sky blue- haired girl with long twintail and sky blue eyes her name is Shiota Nagisa. The whole class begin to stand up with a gun in their hand point at their teacher.

"Attention!" they're focus on pointing at their teacher.

"Bow!" The whole class begin to shoot at their teacher.

"Good morning, fire all you like. I'll be taking attendance," Their teacher said and dodging the bullets that come form class shoting at him.

"Isogai-kun?" he said. "H-here," Reply Isogai Yuuma, he has black hair and golden eyes.

"I'm sorry, but you must speak up with all the gunfire. Otherwise I can't hear you," and then Isogai said "Here!" with a louder voice.

"Okajima-kun?

"Here!"

"Okuda-san?"

"Here!"

"Kataoka-san?"

"Here!"

"Kayano-san?"

"Here!"

"Kanzaki-san"

"Here!"

And they keep shooting until the last name in the class absent, when he finished the class stopped their gun shoot. Looks like the whole class out of breath, he closed the roll book , " Good, no Student absent today," And then his yellow face change to orange with big O red mark, "Excellent, that makes me very happy," he said.

"He's too fast!" said Nakamura Rio, girl with long blonde hair and ocean blue eyes while catching her breath, and then Isogai said, "So the whole class shooting at him doesn't work?" while catching his breath. 'We are killers, and our targets are our teacher' thought Nagisa looking at the gun in her hand.

"Too bad, no bullets can hit me either today. Method that rely on sheer lack any individual thought. Line of sight, barrel position, finger movement – each of these is far too simple. You've got to be more inventive! Otherwise... you'll never be able to kill me at my max speed of Mach 20." He said with understimated voice.

"But, like you see, no way did you seriously dodge all of those!" Said Maehara Hiroto, the boy who has light orange hair and orange with tint of yellow eyes. "I mean, these are just BB'S. You could just stood there, grittin your teeth as they hit you." Said black haired boy with steel blue eyes, and the whole class have same thought with Sugino Tomohito.

After hearing them, their teacher look dejected and said, "Gather up the BB's and hand them over," he take Okano Hinata's gun, the girl who has short brown hair like a boy, and deep purple eyes. Their teacher continue with what he said, "I told you: 'these may be harmless to you.." he shoot his own hand, and his hand fall into classroom floor. The whole class look shock.

"But they're special anti-me BB's developed by the goverment. If one hits me, it can slice through my cells like they were tofu. Ah... of course, they regenerate a few second later." They see his hand grow again to it's usual form, "Then again, you could end up shooting your eyes out. No shooting in the classroom unless you're trying to kill me." His face change into yellow with green strip and he said, "I do hope you can kill me – before graduation, that is."

"Now then, let's put away the guns and BB's and start on our work," and the students begin to back to their own desk.

'Class 3-E of Kunugigaoka Junior High School: The Assassination Classroom. How did we end up like this? Two things happened at once as our third year began, the first was the moon suddenly exploding into crescent, the whole world panic with these news. And the second was...'Nagisa thought and take a glance at the now permanent crescent moon.

A couple man and woman in black with a creature look like an yellow octopus entering their classroom, the class look at the yellow creature with a big question mark and shock.

'WHAT THE HELL IS THAT CREATURE?! A big yellow octopus?!' They tought.

The creature began to spoke, "How do you do? I'm the one who blasted your moon," the whole class have a blank face after this information out. "I plan to do the same to the earth next year. Now I'm your teacher, nice to meet you." He said with a smile that will never gone in his face.

'There are at least six things wrong with this picture!' the whole class though, the feeling was unanimous for them.

After that, the raven haired man who stand in the left of the creature begin to spoke, "I'm Tadaomi Karasuma from the Ministry of Defense. First, please understand that what I'm about to say is a state secret. Let me be blunt: I want you to kill this creature." The whole class shock after hear what he said, but his dark maroon eyes look piercing to the whole class.

'He want us to kill a unditified creature that destroy the moon into crescent and want to destroy Earth next year? It seems nonsense, but.. if he's here I bet his going to like this,' Nagisa tough and look at the empty desk next to the window.

"Um... What is that? Is that the alien or whatever that come to attack us?" ask Mimura Koki, the boy has orange hair like a mushroom (it's really look like a mushroom for me XD) and yellow eyes.

Hearing Mimura's question, the creature look annoyed and began to make a pink smoke out of his head, "How rude! I'll have you know. I was born and raised on Earth!" shaking his slithery hands all over at in front of the classroom.

'He was?' Nagisa tought.

"I'm afraid I can't discuss the details, but he's telling the truth." Karasuma begin to spoke again. "March next year, this creature who smashed the moon will destroy Earth as well. Only the world's leaders know about this. If news of this guy gets out there, we'd be looking at a global panic. You've got to kill him in secret before that happens. In other words...'' he to took out a green knive form behind his clothes and began to attack the creature, "an assassination," but the creature move with a speed that eyes can't follow.

"But this guy is extremely fast! You try to kill him and he ends up grooming your eyebrows instead – immaculately!" the class look at Karasuma who's still trying to attack that creature, but end up with the creature trimming his eyebrow and the creature's face change into pink color. When Karasuma began to attack again, the creature began to move again with a high speed that make a big wind inside the class.

"This superbeing has the power to turn a full moon into a crescent, his speed tops out at Mach 20! In short, if he gets away, we'll be left helpless awaiting our destruction." He said.

The creature place the tools he use to its place and said, " and that's no fun. So I made your goverment an offer: no killing me." And when he put his hand at Karasuma shoulder, a tick mark visible at Karasuma's head. "Instead, I'll teach Class 3-E at Kunugigaoka Junior High School."

'What? Why us?' the whole class thought.

'That's what I want to know too!' Karasuma's tought.

"We don't know what he's after. But we were forced to agree, on the condition that he doesn't harm any of you students. We have to reasons: first and foremost, coming to a classroom every day lets us keep an eye on him. Second, it gives some thirty people the opportunity to kill him from extremely close range." Said Karasuma. "And the success will be rewarded with ten billion yen," hearing this the whole class eyes began to lit up.

"A successful assassination will literally save the earth. Luckily, he doesn't think much you." The creature yellow face change into yellow with green stripes, "See? Those green stripes mean he's looking down on you!"

'What the hell with that skin?!'

"Obiviously! If the goverment can't kill me, how could you? Even when they sent their cutting-edge fighter jets after me... I ended up giving them a coat of wax right there in the midair!" said the creature.

'What's with all the grooming?'

'The hell with his clean fetish?!'

And the classroom door open again with some agent bring grey box with and weapons into the class, Karasuma begin to spoke again, " You must find a chick in his defenses and stike at it. You'll have weapons and ammo that won't hurt humans, but will work on him. You must keep this secret from your family and friends," Nagisa sent a worry glance at the empty desk beside her, 'Ughh.. I bet he will supicious of me, I never be able to hide things from him. The same for him too...,' she thought.

"There's no time to lose. If the earth disappear, we'll have nowhere left to run." Said Karasuma. The creatures, no the yellow octopus spoke again, "And that's about it! Now let's make the most of your one remaning year!" with a wicked face.

The lunch time bell ringing. The yellow octopus stopping their lesson for lunch break and go to the window, "I'll just pop over to China for some mapo tofu," and then he's gone, leaving with a big wind blast in the classroom.

"Let's see... if he's traveling at Mach 20..." Said Nakamura. "It'll take maybe ten minutes to get to Sichuan, home of mapo tofu," said Nagisa.

"But, not just his speed is unbelieveable. Can you imagine, he's even grading our test at that speed!" said Maehara.

"Don't you think he's pretty good at teaching, tough?" ask Nakamura.

"Yeah... but we are the E Class." Said Mimura. "Trying our best won't do much," said Okajima Taiga, the boy who has a bald head and black eyes.

'Yeah... even though he's a good teacher, we can't change the fact that we're the E class. Our conditions different from the other class at this school... altough a certain red head I know will never care about this condition...,'thought Nagisa.

"Oi, Nagisa," called Terasaka Ryoma, "Come with us. It's time to put our assassination plan into action," said Terasaka, the boy has dual hair color, brown on top and yellow at the under with yellow eyes. And walk out from the classroom with his other two friends.

Nagisa stand up from her chair and begin to follow them, but before she's out of the classroom a hand make her stop. A girl with green hair into high twintail and have a hazel eyes look at Nagisa with worried face, "Nagisa-chan, you don't have to do this... their plans never be good for others," said Kayano Kaede, the almost closest friend she has in the class.

Nagisa smile and said, "It's okay, Kayano-chan." And continue walk out from the classroom.

The other classmate have the same face as Kayano, they worried for the small girl who's going talk with the class deliquent. 'Nagisa-chan...' thought Kayano, looking at Nagisa small back.

At the stair that connected to outdoor clearing in the back of their classroom, Terasaka with his two other friends sat at the stairs and Nagisa stand at the in front of them with a small note attach at her hand.

"That octopus's face changes color according to his mood, right? Did you do those observations I told you?" ask Terasaka. The other two boys with him, one have a bright yellow hair with pointy eyes and the other have like a afro black hair with the same black eyes. Their name is Muramatsu Takuya and Yoshida Taisei.

Nagisa nodding her head at Terasaka question, she began to read what she write on those small notes, "More or less. We know it's striped green when he's feeling confident. When we give a wrong answer, it's dark purple with darker shade of purple X mark. A right answer makes it go bright orange with big O red mark. But what's really interesting is after lunch-" before she finished with her words, Terasaka cut off her speach with impatient voice.

"I don't need to know all that!" and began to go down form his current possition and stand in front of small sky blue haired girl. "I have a plan... and when he lets his guard down the most, you are going to carry t out." While pointing his anti-sensei's knive at her.

"M-me? But..." said Nagisa with hestitate voice. Terasaka make his face closer to the small girl with visible tick mark at his forehead and said, "Don't be such a goody-goody. We're the E class – the misfits that can't keep up at this famous prep school. They call us... the End Class. Every day, they send us to this isolated mountaintop campus, discriminating us like we're scum," put his arm around Nagisa's neck. You can see a visible unconfortable face from small blue sky haired girl, and she's avoid Terasaka gaze with looking at the other direction.

"When would us losers, ever in our lives have another chance to score a cool ten billion yen? We're gonna make it – make it through this crappy situation..." said Terasaka, he put his hand in the pocket and pulling out a small orange pouch into his hand. "By any means necessary," with finality voice and drop the pouch into the small girl, "Just don't screw up... Nagisa-chan," and then Terasaka with his other two friend leave the small girl alone.

"I heard that Nagisa is headed for E class."

"Ooh. Well, that's it for her."

"I'm gonna delete his contact info!"

"Me too, I don't even want to think of us on the same level!"

"Nagisa-chan~ you're really going to E class?"

"Yeah... If you don't wanna to be my friend again, it's okay. I'm Understand..."

"What? Are you stupid? I'll be your friend, even when you're in the E class. Don't care about other's say~~"

"Thank you..."

Nagisa touch the necklace that resting around her neck behind her clothes and lost in thought, and then she hear a sound. A second later, her teacher landing behind her. She rotate her body to face her teacher , hidding the small pouch behind her body and take away her hand form her necklace. "I'm back!" said the teacher.

"W-welcome back, sir..." said Nagisa, and the she's see a giant missile in her teacher hand. "What's with the missile?" ask Nagisa.

"A souvenir. The SDF was waiting for me in the Sea of Japan," said the yellow octopus. His answer make Nagisa sweeet drop, "I-it must be terrible, being a target."

"Not at all. You know, you're powerful when everyone has it in for you," with this statement make her realise something. "Now let's begin fifth period," said the creature and walking to the classroom.

"Yes, sir.." reply Nagisa. 'That's right.. when someone being everyone's assassination target, that means they all acknowledge your power. A creature like that wouldn't understand what it's like being unworthy of anyone's expectations or fear, or even their recognition... I might just be able to kill him. After all... this teacher can't see me, either,' thought Nagisa while balled her fist into the strap of the small pouch.

"All right, class – compose a short poem to go along with our theme. The final line should be "was tentacles all along."" Said their teacher.

The line makes the whole class confused, "Huh?" and a girl with long straight black hair and yellow eyes raise her hand and ask "Was the tentacles all along?" her name is Kanzaki Yukiko, the class primadona.

"Yes. When you're finished, bring them to me. I'm looking for proper grammar and whether you've conveyed the tentacle's beauty," he said, but the class still confused with the line so their teacher give them an example.

"'It was tentacles?' really?" said isogai. "Once you're done, you're free to go home!" Said their yellow octopus teacher.

That make a whole class protest because, they stil have no idea for what they're going to write. "How are we gonna write about that?" ask the girl with strawberry blonde hair that reach until above her shoulder and she has a light green eyes, her name is Kurahashi Hinano.

"Now, now – aren't any marvelously slithery phrases coming to mind?" ask their teacher, "Slither slither slither slither!" while move his tentacles all around him. "Enough with the slithering!" yell Maehara.

"Sensei, I have a question!" said kayano form the back of classroom. Nagisa saw their teacher skin began change into light pink color and a little late to respond kayano words. "Ah.. yes, Kayano-san?" ask the yellow teacher.

"This is a weird question to ask now, but... what's your name?" ask Kayano.

"My... name?" reply their teacher, he seems lost in thought. "Hmmm... I don't really have the kind of name to tell other people. Go ahead and give me one," he said, that makes the whole class sweet drop.

"But right now, focus on your schoolwork. Meanwhile, I'll just take a little break." He said again, and then his skin began turning into light pink again.

After see their teacher condition, Nagisa shadowing her sky blue eyes with her bangs and she's stand up from her chair. She's hidding her anti-sensei's knive behind her wroking paper and walking to their teacher with her poker face to masked her bloodlust. The whole class seems agitated after seeing knive at back of her paperwork and Terasaka smirking from his desk.

'After lunch, right around the the time he get sleepy, his face sometimes goes light pink. He was a little slow responding to Kayano-chan's question, too. That might be when he's at his most vulnerable,' Thought Nagisa.

After she's reaching in front of class, face-to-face with their teacher. She's bring out her knive and make an attempt to stab her teacher but, the knive never reach their teacher because he put his hand around Nagisa's wrist to stop her movement. "I told you: be more inventive!" he said, and take away the green knive with a handkerchief.

'I bet he will angry at me to do this kind of things. I want to see him again...,' thought Nagisa, in her mind flashing a boy with red hair and mercury eyes with mischevious smile.

And then Nagisa throw her self to the yellow octopus teacher and hugging him, he seems shock and his skin began to change to it's original colour. 'What?! I can't read her movements earlier. In facts, I can't feel her bloodlust!' His thought.

His thought gone after he saw a grenade around his student neck, 'A grenade?!' and Terasaka push the red button on remote control for that grenade from his desk.

BOOM!

The grenade explode, and makes many BB's bullets flying in the classroom. "Yess!" yell Terasaka with his two friend. The whole class seems shock with suicide actions from their small female classmate.

"Nagisa-chan!" yell Kayano and stand up from her chair.

"Serves, you right!" yell Terasaka again and walking to in front of classroom with smug face.

"Terasaka!" yell Isogai, "What have you done?!" yell Maehara to the three of them.

"Bet he never expected a suicide bomber!" said Terasaka while looking at the brunt skin octupus. "What did you do to Nagisa-chan?!" yell Kayano, while her tears began to pilling up in her eyes. She's worried about her small friend, 'Please be save... Nagisa-chan!'

"Huh? A toy grenade. But I beefed it up with gunpowder, so it's shoot three hundred anti-sensei bullets at crazy high speed! They're not strong enough to kill anybody, my ten bilion yen will cover her medical bi-" Terasaka stopped in the middle of his speach when he's looked at a transparent membrane that protect Nagisa from the explosion. "Huh? Not a single burnt?" and pick up the transparent membrane.

Kayano run into her friend when she hear her friend save and her sky blue haired friend into sitting position. "Nagisa-chan! Are you hurt?!" while looking any visible injuries at her friends.

"I-I'm okay..." Reply Nagisa.

Suddenly a chilling air filled the whole room, it came form their teacher who attach himself to the ceiling of the classroom. "As it happens, I shed my skin once a month. I protected Nagisa-san there by covering her with my old skin. It's my once-monthly ace-in-the-hole." With a chilling voice.

"Terasaka, Yoshida, Muramatsu," His skin began to change into the colour of pitch black, their teacher is furious, " You three behind this, yes?" and the three of them, no, the whole class feeling afraid at the pitch black teacher in the ceiling. They're denied him, and suddenly he's flying out of classroom at the speed of sounds and a few second later he comeback with a bag full of our nameplate house in his hand.

He's drop Terasaka, Yoshida and Muramatsu nameplates, "My agreement with your government says I won't harm you. But if you try another assassination like that one, i might just harm someone else," and he begin to drop all the nameplates into the classroom floor, "Your family, your friends, or I could wipe out the whole planet apart from you," showing his sharp pointy teeth.

Fear seeping through into their skin and they all knew: there was no running to the ends of the earth for them. If they really wanted to run... all they could do, is kill him!

"What the hell's your deal?! You're just a giant pain!" Said Terasaka pointing at their furious teacher with a voice full fear, his two friend cowered in fear too. "What's wrong with using an annoying method to kill an annoying guy?!"

Suddenly their teacher back to normal and his face change colours into orange and big O red mark, "Annoying? Hardly. Your idea itself was a very good one. Especially you, Nagisa-san," he said and petting Nagisa's sky blue hair with his tentacles hand, "The way you carried yourself so naturally on your approach gets a full marks. You made it right through the chink in my defenses."

And then he pointing at Terasaka, Yoshida and Muramatsu, "However! None of you looked out for Nagisa, not even Nagisa herself. Students like that aren't fir to assassinate anyone," his face change into purple with big X mark with the colour of darker shade purple.

"We need an assassination worth smilling about one to be proud of! You're all capable assassins who have that power within you. This is some advice from your teacher and target." While facing all students in class with his normal face.

'His unusual education, made me pretty happy. Because this unusual teacher was actually looking at us head-on,' thought Nagisa while she stand up with Kayano's help and looking at their teacher, her teacher looking back at her with slightly larger never ending smile.

"Here some question for you, Nagisa san: 'I have no slightest intention of being killed. I wil enjoy my time you all until next March, and then blow Earth up'. If you don't like it, what are you going to do about it?" ask the teacher to Nagisa.

'I think this teacher, might even accept my bloodlust,' thought Nagisa. With a smile Nagisa reply those question, "Before you destroy Earth... I'll kill you."

After hearing Nagisa answer, their teacher changing his face into yellow with green stripe, "Then try to kill me now! Once you've killed me, you're free to go home!" that's makes the whole class protest while Nagisa and Kayano back into their own desk with sweet drop and their teacher begin to wipe their home nameplate.

"An unkillable teacher... "Korosenai"..."koro"... Oh! How about "Koro-sensei"?" said Kayano.

"Koro-sensei?" ask Nagisa while look at her friend.

"Nyuaa?" Kayano's words make our teacher stopped his activities and looking at us, he seems like his new name.

'It's us and Koro-sensei, in our assassination classroom,' thought Nagisa with a smile and looking at her super-being teacher.

We are killers, and out target is our teacher. Another day, another class bell rings.

AN: hello guys~~ nice to meet you all ^^. Hope you guys enjoy my story, I'm sorry for the gramatical error and bored story line. This is my first fanfiction and my first time writing a story without my main language. Sorry if this story have to much same with the original anime. I don't want to change the plot, because I love the original plot. But don't worry you'll have more Karmagisa moments in my story and you can suggest me another couple, I already have one in my mind. Like Chiba x Hayami, they the coolest couple that I ever saw XD.

Believe me or not, I'm writting this story while watching the anime too hahahahahaha... and for updates, I'll try to update this story once a week. Because you know, college and work.. and I'm already at my final year. Don't forget to review~~ciao~~