Assassination Classroom Is a Japanese mange series written and illustrated by Yūsei Matsui. The series follows the daily lives of an extremely powerful octopus-like creature who also works as a junior high schoolteacher, and his students dedicated to the task of assassinating him to prevent Earth from being destroyed. The students are considered "misfits" in their school and are taught in a separate building, the class he teaches is called 3-E.
https://youtu.be/kgNkGohA20k
