At Kunugigaoka Middle School, a new and rather bizarre teacher is introduced to the students of class 3-E. He is, in fact, a being equipped with tentacles, with a round head, capable of moving at Mach 20, and whose skin color changes according to his mood. Before presenting himself to his new class, he pulverizes part of the moon, giving it a permanent crescent shape. The mysterious being declares that by the end of the year he will also destroy the Earth, but, for obscure reasons, he decides, meanwhile, to start teaching at the middle school. With practically the entire world under his control, the Japanese government, though reluctant, decides to grant his request, on the condition that he does not harm the students. Thus, the students end up playfully calling him Korosensei, the invulnerable teacher. Along their journey to become professional assassins, those same students greet him every day with assassination attempts, trying to kill him to save the planet and to receive from the government the 30 billion yen reward.
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