The Assassination Classroom in class 3-E. Where students are trained to kill tragets also, In there, the moon has just gotten destroyed by something to 70%. Class 3-E has just gotten a new student and also with that, a new teacher along with that.

The new student are you, but strangely on the same day, that octupus alian thing came and explained; that he's gonna destroy the earth in one year exactly, if the class can't kill him until the then. So the class tryes their best to shoot him, stab him or kill him in any possible way, but with his speed of 20, it's almost impossible.

(September 15th)

It was everything like any other school day, Koro-sensei teached the students while they tryed to shoot him with these rubber bullets and knifes which can't hurt humans, but him. And in lunch you tryed your luck and threw a ball with these rubber bullets in it at Koro-sensei, who was like Nagisa said on a bench in the forest

Nagisa watched, as you threw the ball but Koro-sensei was alredy gone and greeted you two with his usal smile on his alien face. Now you're kinda fristrated and upset about that you coulnd't get him and later that day you sat alone on the stairs entrance from the old school building.

(Koro-sensei came)

Soon Koro-sensei walked by and saw you sitting there in a depressed mood, so he sat next to you and spoke with you, until he suddently grabbed you gently with his tentacles, held you in the air and let his tentacles go around you to exaimn you. But that didn't looked healtly at all since there is literly his tentacle arm in your mouth, the others around your arms and legs, and 2 around your torso.

Just then, Nagisa came out and thought Koro-sensei broke his promise and is hurting you, but he isn't.

Nagisa runns torwards you and shouts "K-Koro-sensei! What are you doing, you aren't allowed to hurt any students!!"

but Koro-sensei only chuckled and kept you in the air "I'm not hurting {user}, I'm exaiming them to help them with their throwing Technology" and he smiles