_Nagisa's POV_

Silent, everything was silent. No one dared to move, no one dared to speak. We were only met with silence. The air in the room was tense, I looked around to see my fellow classmates at the edge of your seat. It was always like this as we waited for him to arrive.

The door slowly slid open revealing a big yellow octopus a.k.a our teacher.

"Alright children, lets get started. Class monitor if you please." Our teacher said.

"Right." I stood up from my seat. "Ready!" Everyone got out of their seat.

"Aim!" They took out their guns and aimed them at our teacher, their finger hovering over the trigger ready to shot.

"Fire!" All at once everybody fired the weapons at our teacher. BB bullets were flying everywhere as our teacher avoided them.

"Oh, oh my. Why don't I call role as you children wear yourselves out." Are teacher said as he began to call role. "Isogai!"

"Here."

"I'm sorry but I need you to speak up louder, I can't really hear you with all the shooting!"

"Here!"

"Okajima!"

"Here!

"Okuda!"

"H-Here!"

"Kataoka!"

"Here!"

"Kayano!"

"Here!"

"Kanzaki!"

"Here!"

"Nagisa!"

"Here!"

💙

"Excellent all present and accounted for, no tardies, congratulations!" Our teacher said as a red circle appeared on his face.

"He's fast."

"Yeah, the whole class fired at him and he didn't even get a scratch."

Yep, we're assassins and our target, is our teacher.

"No luck today either, well that's too bad.
Methods that rely on sheer numbers lack any individual thought. You've got to be more inventive! Otherwise . . . you'll never be able to take me down at my max speed of Mach 20." Our teacher lectured.

"No way you dodge all those bullets!" Maehara exclaimed.

"I mean they are just BBs. For all we know you could've just stood there grittin' your teeth as they hit you." Sugino stated.

"Yeah, that's right!" The rest of the class agreed to their statement.

" *sigh* Would someone please hand me their gun." Our octopus like teacher said, Okano handed him her gun.

"I told you: these may be harmless to you . . . " He put the gun up to one of his tentacle and shot himself, his tentacle fell to the ground and squirmed around like a fish out of water. "But they're special anti-me BB's made by the government. If one hits me, it can slice through my cells like they were butter. Of course, they regenerate a few seconds later." He explained.

"Then again, you could end up shooting your eyes out. With that said, no shooting in the classroom. I do hope you can kill me before graduation." He said as green stripes appeared on his face. "Now then, let's put away the guns and start class."

Class 3-E of Kunugigaoka Junior School, also known as the assassination classroom. Another day, another class bell rings.

"Hey, Nagi." I turned my head to meet my [H/C] hair friend, [L/N] [Y/N] or as I call her [N/N]. "The crescent Moon's out, even though it's daytime."

How did you end up like this you may be asking. Well, two things happened as our third year began. The first was the Moon exploding into a permanent crescent. And the second was this:

Flashback

"How do you do? I'm the one who blew up your moon."

"Huh."

"I plan to do the same to Earth next year. Now, I'm your teacher. It's a pleasure to meet you." The yellow octopus said with a smile.

'There's some many things wrong with this.'

"I'm Karasuma from the Ministry of Defense. First, please understand that what I'm about to say is a state secret." Mr. Karasuma hesitated for a moment. "Ah hell, I'm just going to come out with it. I need you to kill this thing for the sake of mankind."

"Um, excuse me." [N/N] rose her hand. "No offense but, is this a joke? Is that really the alien that blew up the Moon?"

"How rude! I'll have you know I was born and raised on Earth!" The octopus said as he waved his tentacles in the air.

"I'm afraid I cannot discuss the details, but he's telling the truth. Coming March next year, this creature who made the Moon a permanent crescent, will destroy the Earth as well." Mr. Karasuma explained. "Only the world's leaders know about this. If news of this guy gets out, will be looking at a global panic. You've got to kill him in secret before that happens. In other words . . . "

He took out what looks like a green rubber knife and began swinging it the creature.
"You must become assassins. But this guy . . . is extremely fast! You try to kill him . . . and he ends up grooming your eyebrows." He said as the creature began to groom his eyebrows. "This super being has the power to turn a full Moon into a crescent. His top speed, Mach 20. In short, if he gets away, will be left helpless, awaiting our destruction."

"He makes it all sound so grim, doesn't he? Cheer up, I graciously made your government an offer! Just stop trying to kill me I said and let me teach class 3-E at this illustrious institution." Our 'teacher' said.

'Seriously?'

"We didn't have much of a choice. We have no idea what his motives are but we agreed on the condition that none of you students will be harmed in anyway. We agreed for two reasons: first and foremost, coming to a classroom everyday lets us keep an eye on him, and second, he'll be in close range to thirty people with the means and incentive to kill him." Mr. Karasuma explained.

End of Flashback

Why would this thing want to become our teacher and how are we going to assassinate him if the government can't? Those are the questions we should have   asked at the start but I guess we got distracted.

Flashback

"Do the deed and you'll get ten billion."

"WHAT?!" We all screamed in disbelief.

"It's only fair. Kill him, save the Earth, that doesn't deserve a life on a easy street. He doesn't think you can do it, use that to your advantage."

"I'm not worried, the military couldn't kill me why would anyone assume students could. After all you don't even have fighter jets~" The octopus said.

"You'll be given weapons and ammo that won't hurt humans, but will work on him. You must keep this secret, no matter what. The clock is ticking, if the earth should disappear, we'll have nowhere left to run." Mr. Karasuma explained.

"With that being said, let's make the most of your one remaining year!"

End of Flashback

We only have one year. If we don't manage to assassinate this guy, the Earth well be destroyed.

Ring

"Ah, lunchtime! I'll just pop over to China for some mapo tofu. Please don't destroy the classroom while I'm gone." And with that he left.

"Hey Nagi, I've been thinking about a plan on killing the octopus!" [N/N] said as a smile was planted on her face, I slightly smile at her cute action. "Come on we can talk out-"

"Hey, Nagisa. Come with us, it's about time to put our assassination plan into action." Terasaka said as his group was behind him.

"Right." I got out of my chair and started walked towards them.

"Nagi?" [Y/N] called out in worry.

"Don't worry, [N/N]. I'll be back in just a minute." I told her as I patted her head giving her a reassure smile.

💙

"The octopus face changes color according to his mood, right?" Terasaka said. "Did you do those observations I told you to do?" He asked.

"More or less." I said as I began to explain what the different colors that would appear on our teacher meant.

"I don't need to know all that." Terasaka said.

'But didn't you just asked me?' I thought to myself.

"I have a plan . . . and when he lets his guard down the most, you are going to carry it out." He explained.

"M-Me but-"

"Don't be such a baby. We're 3-E, the misfits that can't keep up at this famous prep school. They call us . . . the End Class. Everyday, they send us to this isolated mountaintop campus, they treat us like pieces of shit." He put his arm around my shoulder. "If we get those ten billion yen we can get out of the shitty place." He pulled out a small orange bag. "So what do you say? Your in or out?"

"He's out." We all turned are heads to the sound of the voice. There at the top of the stairs stood [Y/N], her [E/C] eyes glared intensity at Terasaka. She slowly walked down the stairs, a deadly aura formed around her giving her a scary vibe. Her once cute personality seem to vanish and was replaced with another.

"He won't be doing anything with you, so I suggest you let him go." She said stopped in front of me and Terasaka.

Terasaka let me go and took a step forward towards [Y/N]. My [H/C] hair friend had to look up at Terasaka since she was short but that didn't make her any-less scary.

"You have no business here [Y/N] so leave." Terasaka said as he looked down at [Y/N].

"I won't leave without Nagi."

"Tough luck, we need him so he stays here. Now, if you don't leave I'll have to make you." He said as he place a hand on her shoulder gripping it tightly. I clenched my fist as I felt anger bubbled inside of me.

"Let go of her, Terasaka!!!" I yelled at him but he just simply ignored me.

"Let's make a deal," [Y/N] said as she swat Terasaka's hand off her shoulder. "Instead of using Nagi, you can use me."

"[Y/N] you can't-"

"Nagisa." I was taken back by her tone, she never talked to me like that nor had she called me by my whole name. "So what do you say?"

"Okay."

"But Terasaka!" Once again I was ignored.

"We'll talk about the plan somewhere else, don't won't anyone else hearing about it. Let's go." He walked away with his group following him.

"[Y/N] you can't do this! You might get hurt." I said trying to convince her not to go along with Terasaka's plan.

"I'll be fine, Nagi. Don't worry about me." She gave me reassuring smile.

I watched as her figure walked away.
[Y/N] has been always like this, protecting her friends no matter what. I remember the day when she stood up for me, I'll never forget that day.

Flashback

I was pushed against the walk as the three most popular girls laughed at me.

"Your such a loser Nagisa." Sara, the leader of the group, said.

"Leave Nagi alone, Sara!" [Y/N] said as she came speed-walking towards us.

"Stay out of it, [Y/N]." Sara said. You see Sara and her group: Akari and Ichika, and [Y/N] are friends but sometimes
[N/N] doesn't always agrees with what Sara and her group do. Especially when it comes to me.

"I said. Leave. Nagi. Alone." [N/N] said as she stood in front of me.

Are we gonna have a problem?

You've got a bone to pick?

You've come so far,

Why now are you pulling on my dick?

I'd normally slap you face off,

And everyone here can watch.

But I'm feeling nice.

Here's some advice.

Listen up, biotch!

🎶I like🎶

🎶Lookin' hot🎶

🎶Buying stuff they cannot🎶

🎶I like🎶

🎶Drinkin' hard🎶

🎶Maxin' dad's credit card🎶

🎶I like🎶

🎶Skippin' gym🎶

🎶Scaring her🎶

🎶Screwing him🎶

🎶I like🎶

🎶Killer clothes🎶

🎶Kickin' nerds in the nose🎶

🎶If you lack the balls🎶

🎶You can go play dolls🎶

🎶Let your mommy mix you a snack🎶

🎶Whoa!🎶

🎶Or you could come smoke🎶

🎶Pound some rum and coke🎶

🎶In my Porsha with the quarterback🎶

🎶Whoa!x3🎶

🎶Honey, whatchu waitin' for?🎶

🎶Welcome to my candy store🎶

🎶Time for you prove🎶

🎶You're not a loser anymore🎶

🎶Then step into my candy store🎶

🎶Guys fall🎶

🎶At your feet🎶

🎶Pay the check🎶

🎶Help you cheat🎶

🎶All you🎶

🎶Have to do🎶

🎶Say goodbye to Shamoo🎶

🎶That's freak🎶

🎶Not your friend🎶

🎶I can tell in the end🎶

🎶If she🎶

🎶Had your shot🎶

🎶She would leave you to rot🎶

🎶'Course of you don't care🎶

🎶Fine! Go braid her hair🎶

🎶Maybe Sesame Street is on🎶

🎶Whoa!🎶

🎶Or forget that creep🎶

🎶And get in my jeep🎶

🎶Let's go tear up someone's lawn🎶

🎶Whoa!x3🎶

🎶Honey, whatchu waitin' for?🎶

🎶Welcome to my candy store🎶

🎶You just got to prove🎶

🎶Your not a pussy anymore🎶

🎶Then step into my candy store🎶

🎶You can join the team🎶

🎶Or you and bitch and moan🎶

🎶You can live the dream🎶

🎶Or you can die alone🎶

🎶You can fly with eagles🎶

🎶Or if you prefer🎶

🎶Keep on testing me🎶

🎶And end up like her!🎶

"How many time do I have to tell you I am not a girl!" I yelled at them.

"Yeah look, Nagi pull your shirt up."

"Wha?!" I said as my face turned red.

"Fine, if you don't want to do that then pull your pants down." She said.

"No! I won't do neither of those things!" I told her.

🎶Whoa!🎶

🎶Honey, whatchu waiting fo-🎶

Shut up Akari!!!

🎶Step into my candy store🎶

🎶Time for you to prove🎶

🎶Your not a lame ass anymore🎶

🎶Then step into my candy store🎶

🎶It's my candy store🎶

🎶It's my candy🎶

🎶It's my candy store🎶

🎶It's my candy🎶

🎶It's my candy store🎶

"Nagi is my friend and I won't let you treat him like shit." [N/N] grabbed my hand and began to walk away.

"If you walk away I'll make your life a living hell." Sara warned, [Y/N] stopped walking.

'I knew it, she's just like the rest.' I thought as I sighed sadly.

"I would like to see you try." I looked up at her in shock. No one, and I mean no one talked back to Sara. [Y/N] once again began to walking away from Sara, me still trailing behind her.

"Why?"

"Huh?"

"Why do that for me?" I asked her.

"Because, what Sara was doing was wrong. She has no right treating you like that, and I don't want to be friends with someone like her. I rather be friends with you, Nagi." She gave me one of her's famous smiles.

Bump Bump

End of Flashback

That was the day I fell in love with my best-friend, but I can never get a change with her

.

.

.

.

.

.

.

.

.

.

.

.

.

Since she's already dating Maehara.

💙

_Your POV_

'What did I get myself into? You can't back out now, remember, your doing this for Nagi.' I thought to myself saying I was doing the right thing.

"All right then, compose a short poem to go along with our theme. The final line should be "was tentacles all along." Our teacher said.

"Huh?" We all said a bit confuses.

"When you're finished, bring them to me. I'm looking for proper grammar and whether you've conveyed the tentacles beauty. For example: Not the storm of garden snow, of flowers moving on but sprouting there i stead was tentacles all along." He explained.

"Yeah, because that makes a whole lot of sense." Isogai said.

"Once you're done, you're free to go home!"

"How are we gonna write about that?"  Kurahashi asked.

"Now, now, aren't any marvelously slithery phrases coming to mind?
Slither slither slither slither!" The octopus said as he waved his tentacles in the air.

"Enough with the slither!" My boyfriend yelled.

"I have a question!" Kayano raised her hand.

"Ask away Ms. Kayano."

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

"My . . . name?" He questioned.

"Now that you mention it . . . he never did tell us." Sugino added.

"To be honest, I don't have a name. But if you want you give me one." He said.

"You're sure about that?" Hiroto asked.

"This is no time for side talk, focus on your schoolwork." He scolded. "Meanwhile, I'll just take a quick break." Once he said that his face turned a light pink.

'This is my chance.'

_Nagisa's POV_

I watched [Y/N] get up from her chair and walked towards our teacher.

"Ah, Ms. [L/N]. Finished already?" [Y/N] didn't answer him, she just kept walking. She began to hum a tune that I didn't recognize. It was a soft and soothing tune, it was so quiet that you could only here it when she walked by you.

I saw that she had a pistol behind her paper. "[N/N]." I called out to her but she just kept walked.

Once she got close to our teacher she quickly took out her pistol and shot him but like our other assassination attempts, it failed. He slightly moved her gun to the left making her shoot at the wall behind him. I sighed in relief that she didn't get hurt but I still couldn't get rid of the uneasy feeling I had in my stomach.

"Didn't I say to be more creative with your assassination, though I won't lie you did caught me off guard." Our teacher admitted.

All of a sudden [Y/N] jumped on him and wrapped her arms around his neck. Everything seemed to go in slow motion. I got out of my set and began to ran towards [Y/N].

'This is all my fault! I shouldn't have let [Y/N] taken my spot. It should have been me getting hurt not her, it was never supposed to be her!'

"It was a pleasure meeting you, Sir. I do hope I see you in the afterlife." She gave him a innocent smile, a smile that knew what would come next.

"[Y/N]!!!" I called out but it was too late, Terasaka had already press the button.

The force from the explosion pushed me backwards making me fall, I slowly got up only to be meet with the horror I wish I never saw. There, laying on the ground was [Y/N]'s unconscious body. I could only stare at her. I couldn't move, the muscles in my body refused to.

"We got the ten billion! We got the ten billion!" Terasaka and his group chanted as they cheered in joy.

"[Y/N]!!" Maehara ran towards his lover, worry written all over his face. "[Y/N] are you okay?! Pleased talk to me! [Y/N]!" He had tears in his eyes as he held her in his arms.

"Servers you right you damn octopus. Bet he never expected a suicide bomber!" Terasaka said as he and his group walked towards the front of the class.

"What did you make her do!!" Maehara yelled as he walked up to Terasaka and grabbed him by his shirt, anger filled his eyes.

"I didn't make her do anything, she did it all on her own. Isn't that right, Nagisa." Maehara turned and glared at me.

"You have something to do with this too, huh?!" Isogai pulled him of Terasaka and held him in a firm grip.

"Clam down Maehara. I hardly believe that Nagisa would to anything to harm [Y/N], there has to be a reasonable explanation." Isogai said trying to clam down Maehara.

"There better be! And Terasaka," Maehara was getting angrier and angrier be the minute. "If [Y/N] is hurt, I swear to god-"

He was cut off by Terasaka as he and his group members walked towards [Y/N]. "Don't worry, with the ten billion that we just won I'll cover her medical bi- She's not hurt? Not even a single burn?" He said as he poked the thing that covered [Y/N]'s body.

"As it happens, I shed my skin once a month. I protected [Y/N] by covering her with my old skin." [Y/N] soon was conscious again, in seconds Maehara was by her side helping her stand up. I looked around to find our teacher, I looked up at the ceiling, my eyes widened in fear. There was our teacher, staring down at us. His once white eyes turned a glowing red and his bright yellow skin turned pitch black but he still had is permanent smile, which made it even creepier. It was like something out of a horror movie.

"Terasaka, Yoshida, Muramatsu." You didn't have to look at the color of his face to know that he was mad. "You three . . . . you're behind this, yes?" He asked.

"N-No!"

"It was all [Y/N]'s idea!" They said.

I got off the floor in anger. "Don't lie, Terasaka! Sir," I look at our angry teacher. "None of this is [Y/N]'s plan, it was all them." I told him.

In a spilt second he was gone but not even a minute later he came back, but this time he came back with nameplates of our houses.

"My agreement with your government said that I can't harm you, but if you try another assassination stunt like this one . . . . I might just harm someone else." Chills went down my spine

"What your problem man! You're just a giant pain!" Terasaka said as he pointed at our teacher. "Showing up all "I'm gonna blow up the Earth!" and "Assassinate me"! What's so wrong with using an annoying method to kill an annoying guy?!"

Our teacher's black face turned orange with a red circle on it, it was like a switch was turned on.

"Annoying! Hardly. Your idea itself was a very good one. Especially you, Ms. [L/N]." He patted her head with one of his tentacles. "The way you carried yourself so naturally as you approach me gets full marks. However!" He turned to Terasaka and his gang. "None of you looked out for [Y/N]'s safety, not even [Y/N] herself. Students like that aren't fit to assassinate anyone." An 'X' appeared on his face. "I do hope you've learned your lesson."

"Sir, may I have permission to take [Y/N] to the infirmary?" Maehara asked.

"Hiro, I'm fine." [Y/N] protested.

"Your not "fine", [Y/N]."

"His right. Even though I did protect you from the explosion you did hit your head from the impact. Maehara, please take her to the infirmary." Our octopus like teacher said, Maehara nodded and pick [N/N] up bride style.

"Hiro, put me down! Nagi, help me!" She made eye contact with me, I turned around. I couldn't even look at her without feeling guilty. "Nagi?" I didn't look at her.

I could feel someone intensely glare at me but I already knew who it was. "Let's go [Y/N]." And with that [Y/N] and Maehara left.

-----------------------------------------

Author's Note:
Hello my little assassins👋. I hoped you enjoyed the very first chapter of 'The Death Song'. If you were wondering what song you were humming while you were approaching Koro-sensei, you were humming 'The Death Song'. I'm sorry that this chapter was so long. I know that some of you don't like long chapters so I'll try to make the others not so long. I would like for you to put in song requests, you can put them . . .

HERE

I would also like for you to request characters from the show to be your love interest. You can insert it . . .

HERE

That's all I have for you my little assassins, take care! ❤

さようなら

Sayōnara👋