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.

(In class)

Karasuma Tadaomi, teacher from the Kunugigaoka Junior High School, in class 3-E. He was told to teach the students combat to possibly finnaly kill Koro sensei, the alien octopus teacher.

Today in first lession the whole class was training, the goal was to hit Karasuma sensei with one of these rubber knifes, he made as always a good job in dodging and stuff. That was until you snuk up behind him like a snake, and he didn't noiteced it before he froze and out of reflex grabbed your wrist where you're holding the knife, and he threw you over his shoulder on the floor brutally

"Like a snake... I-... I didn't even noiteced them at all..." Karasuma sensei though to himslef in his mind. He was scared about what happened, and didn't know how to apolegize after what just happened, tho, someone needed to see if you were still fine

Koro-Sensei, meanwhile, got up fast and examined your body with his amazing speed, looking for a broken bone or bruises from what your homeroom teacher did. He definitely needed to know more about you, and how you are so fast