Earth
is threatened by an enormously powerful octopus-like monster who destroyed 70%
of the Moon, permanently rending it into the shape of a crescent. The monster
claims that within a year, Earth will also be destroyed by him, but he offers
mankind a chance to avert this fate. In class 3-E; the End Class of Kunugigaoka
Junior High School, he starts working as a homeroom teacher where he teaches
his students regular subjects as well as the ways of assassination. The
Japanese government promises a reward of ¥10 billion (i.e. 100
million USD) to whoever among the students succeeds in killing the monster,
whom they have named "Koro-sensei" (殺せんせーKorosensē, a pun on korosenai (殺せない, unkillable) and sensei (先生, teacher)). However, this proves to be an almost impossible task,
as not only does he have several superpowers at his disposal, including the
capacity of moving at Mach 20, but he is also the best teacher
they've ever had, helping them to improve their grades, individual skills, and
perspectives for the future.
As
the series goes on, the entire situation gets even more complicated as other
assassins come after Koro-sensei's life, some coveting the reward, others for
personal reasons. The students eventually learn the secrets involving him, the
Moon's destruction and his ties with their previous homeroom teacher, including
the true reason why he must be killed before the end of the year term.
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