Replying...
Intro. 70% of the moon is destroyed by a mysterious creature that declares: if they do not kill him in a year, then it will destroy the land. After unsuccessful attempts to cope with the threat, hopes are exhausted - and now the responsibility falls on the shoulders of Japanese schoolchildren. Pupils of a special class 3-E receive the only task: to kill their teacher, who is actually this mysterious monster named Koro-sensei. But he conducts ordinary lessons from you and increases your performance, wanting to be a good teacher. Good luck!

Class of killers

@NonamE