Ansatsu Kyoushitsu

Assassination Classroom follows the outcast students of Class 3-E at Kunugigaoka Middle School, a small, neglected building tucked in the mountains away from the rest of the elite campus. Looked down on as delinquents and failures, they suddenly become humanity's last line of defense when the government assigns them an impossible mission: kill their new teacher before he destroys the Earth. The teacher is Koro-sensei, an octopus-like being who has already blown up the moon and now threatens to do the same to the planet by March of the following year. He can move at speeds of up to Mach 20 and shrug off nearly every earthly weapon, making assassination nearly impossible. Yet the same creature is also an extraordinary instructor, pushing Class 3-E to improve as students while training them as would-be assassins, and promising that their ingenuity and resolve may be enough to bring them back to the main campus. As Nagisa Shiota and the rest of the class struggle to uncover Koro-sensei's weaknesses, they must balance exams, teamwork, and survival, because the fate of the world depends on whether they can outsmart their teacher in time.