Assassination Hero

New Homeroom Teacher

"Talk"
'Thought'
_______________________
"Hello, how are you, so, my name is Koro-Sensei and I'm the one who blew up the moon~"
A smiling yellow emoji octopus, wearing a teacher uniform, who also goes by the name of Koro-Sensei, stood before an entire classroom worth of children and said children came in all shapes and sizes, ranging from normal looking humans body with minor changes to very extreme and unnatural designs

"... Huh?"
The entire classroom of students just suddenly realized and process what they just heard, and they couldn't help but wear a very confused and dumbfounded expression

"Next year I plan to do the same to planet Earth, but never mind that now, I'm gonna be your new teacher, isn't that exciting?~"
Koro-Sensei just smiles even more happily, despite saying something very terrifying to the entire class, as everyone just continues to comprehend what they just heard, another person seems to be standing next to the seemingly villainous creature, he just couldn't help but let out a very exhausted sigh

"And I am Shota Aizawa, his co-teacher and… Unfortunately, he is speaking the truth, in wanting to destroy our entire world…"
The tired-looking man, who is now known as Aizawa, confirms the legitimacy of what the creature had said, which did not give anyone any sense of comfort or relief

"And because this creature is such a big threat to the entire world, it is now your job to kill him."
And what Aizawa said next definitely gave everyone some very mixed feelings about the situation they were just told and given

"K-Kill him?..."
One of the students, specifically the one with broccoli-green hair who is named Izuku Midoriya, couldn't help but feel beyond uneasy at the thought of taking another life, even if it was from someone who wanted to destroy the entire world, a feeling shared by most

"Consider it as your first and final test of becoming a true Hero~"
Koro-Sensei, even though he was still smiling, suddenly gave off an aura and spoke in a tone that expressed something less, 'Joyful', in nature

"One day, you will face a Villain who deserves to die, and you will be one who would need to deliver the final blow, so why not start by killing someone who plans to destroy your entire world…"
What Koro-Sensei said struck a chord with everyone as if finally understanding the heaviness of their choices of becoming a Hero

"Of Course! I don't think any of you have what it takes to kill me in the first place, so go ahead and try you noobs, Nurufufufufu!~"
Though after a moment of seriousness, it went back to joyful silliness, as Koro-Sensei's face had some green stripes on them as he then started mocking and teasing everyone in the entire classroom, much to Shota's annoyance

"Of course, we Pro Heroes will also attempt to kill him as well, but it is your job to keep on trying to do so since he will be here teaching you all most of the time."
Aizawa continues to explain to the students more about their situations and what they need to do, which they somewhat come to terms with, while most aren't comfortable with it, they understood it was necessary and would do their very best in accomplishing their first ever mission in becoming Heroes

"Um, but why does he want to teach us if we're supposed to be one to… 'Kill' him?..."
Of course, while some just accepted their new reality, a few, like a certain round face girl with rosy cheeks, known as Ochaco Uraraka, were still hesitant and unsure of their predicament

"We don't know why he decided to do this, but if you do manage to kill him, then not only will all of you receive 10 billion yen each, but all of you will be recognized as the WORLD best heroes, with the one delivering the final blow  being number 1, it's only fair after all."
Even if a few were not sure about all this or were at the very least still hesitant to go first, when Aizawa mentioned the reward of actually saving the world, all of that doubt quickly washed away and was instantly replaced with either newfound interest and even a few excited expression