For Nagisa Shiota and the rest of Class 3-E, a good teacher is also a target they cannot afford to miss. The national government has ordered them to kill Koro-sensei, their octopus-like instructor, who has already destroyed the moon and threatens to destroy Earth by the following March. With a top speed of Mach 20 and resistance to nearly every earthly weapon, he is far beyond an ordinary assassin's reach.
Class 3-E's students are outcasts at the elite Kunugigaoka Middle School, relegated to a rundown building in the nearby mountains and dismissed by their peers. Yet the being they must eliminate proves remarkably capable of teaching them. Koro-sensei nurtures both their academic progress and assassination skills, confident they can earn a return to the main campus. Through repeated attempts, Nagisa and his classmates must uncover a weakness in the teacher helping them succeed.
