[NOT CONTINUED] Once Upon A Blue - A Nagisa Shiota x Reader fanfiction

• D I S C L A I M E R •

This chapter contain spoilers of Koro Sensei's upcoming death. It covers the last half of episode 22. Read at your own risk ( ^ω^ )

YOUR POV

"Terasaka, all of you...how about I give you some word of wisdom?" Koro Sensei offered.

"As you go through life the mighty current of society is bound to get in your way, and there will certainly be times things don't go as you'd hoped. When this happens, do not look to society for a cause."

"Do not renounce society. Frankly, you'd be wasting your time. Instead, just say, 'That's life!' and muddle your way through with frustration. Once you're past it consider; if society's swift is tossing you around, how should you be swimming there in its midst? You should have learned how, here in the E class, in this assassination classroom."

"You don't always have to stand and face it head-on. You can run and you can hide. If it's not against the rules, you can try a sneak attack. You can use unconventional weapons. Stay determined- not impatient nor discouraged- with repeated trial and error, you're bound to reach a splendid outcome eventually."

"That's because each and every one of you is a top-tier assassin who can do just that."

Terasaka tilted his head a little, "Geez. A lesson, Really? Now?"

"Nurufufufu," Koro Sensei laughed. "Now's the time for this lesson. An educator never misses an opportunity to teach. But you know," He placed a tentacle on our heads. "For you to try so whole-heartedly to save me...I'm so happy. I've been holding my tears this whole time."

"I mean it."

Koro Sensei wiped his small eyes, he was proud of us. His words made me truly understand his being as a teacher. I couldn't hold my tears. Even though he knew he's about to die, he's so... calm. Why?

"By the way, Nakamura-san," Koro Sensei turned his head at her. "Your footsteps were awfully gentle, even during that pitched battle. And... do I smell something sweet?"

I snorted a small laugh, Nakamura shook her head and gave me a look saying, this guy found out about it man. "Sharp ears and a sharp nose... It's been exactly one year since the moon exploded, right?" She opened her fannypack (?) and took a small cake box that we both bought earlier.

"As I recall, Yukimura-Sensei made today your birthday. Feel free to raise my skill in getting this here in one p- HEY! I'M TALKING!" She was interrupted by Koro Sensei admiring his cake. "But... It's just... It's my first sweet anything in a week!"

"Ew, you're drooling! Come on guys- let's get singing!" Nakamura lit up a candle and placed it on the cake. "And, go!"

Happy birthday to you (2x)... Happy birthday dear Koro Sensei... happy birthday to you~!

We all cheered after we sang. Poor Sensei for not having any sweets for a week! "C'mon, blow it out, Koro Sensei!" Okajima shouted. "There's just one, so make it count!" Koro Sensei was about to blow out the candle, until suddenly a sharp black object smashed the cake from behind.

We were shocked. We didn't know any traces of this coming.

"Happy birthday."

A man with white robe and a man with a black jacket walked in. "Nagisa," I nudged his side. "That's Yanagisawa isn't it?" He nodded. "Shi- No!" Terasaka said, almost calling his fake name.

"Yanagisawa..." Koro Sensei slowly called his name. "The time is ripe. Let me give you the gift of the world's cruelest death." Said Yanagisawa. "Sensei... You know who I am, don't you?" The man in jacket said.

"Kayano look," I whispered and pointed at the man. "It's wiggling, ew." Kayano scrunched her face in disgust. "God, you're right..." The man in jacket slowly walked towards us, "Why don't I reintroduce him- to your students too."

The man in jacket's body starts to deform. The jacket was torn to pieces- his body grew into this black huge monster with massive sharp... Tentacles. "He's the man who stole the name 'The Reaper' from that octopus." Yanagisawa continued, "And... As of today, he's the new Koro Sensei."

We were startled. From what i've heard, he was the man who abducted Bitch-senei in order to lure us and Koro Sensei in his trap. He was also used to be Koro Sensei's pupil in order to become a hitman unfortunately, there was the element of betrayal. "It's not so much that I was lacking. I just didn't understand anything back then." Koro Sensei said regretfully. "You were my first student, and I... I wasn't seeing you."

The God of Death 2.0 jumped and landed on top of the campus' rooftop. "That... Is that thing?!" Yoshida said, shocked by looking at the once-a-human-now-a-monster. "Before it was his face- now his whole body is a monster!" Muramatsu shouted. "He's just had the same modifications as that octopus." Yanagisawa approached us and explained. "The only difference is that he begged for them."

"Compeletely unlike that botched Itona or my little sister over there. Can you even imagine? A man who overpowered you singlehandedly even as a human now has both incomparable tentacles and hatred. The destructive power...!"

"-DIE!" God of Death 2.0 shouted as he jumped towards us. He knocked over Koro Sensei with his tentacle, making a huge velocity of sound that made all of us flew and fell to the ground. "A sonic boom." Yanagisawa informed. "His tentacles have an initial velocity of Mach 2. And they can reach to a top speed of..."

"Mach 40."

"M-Mach 40?!" Okajima exclaimed. Does this Yanagisawa guy really love science that much that he's even willing to transform a human into this creature just to kill our teacher? He needs to chill. "In short, his basic performance is doubled." Yanagisawa continued. "2.0's superhuman kinetic vision and intuition are amplified via his tentacles, making him readily adaptable to a supersonic world."

"Unlike some amateur children, he took to his tentacles readily- just like 1.0 version over there." Call him by his name, dumb fuck. God of Death 2.0 slammed his tentacles over Koro Sensei, he was thrown to the ground by 2.0's massive power.

"KORO SENSEI!"

• A F T E R W O R D S •

Damn this was long ヽ(￣д￣;)ノi'll shorten the yanagisawa part a bit for the next one ;D (Ye there's going to be 0.3 and 0.4)