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Koro-sensei (殺せんせー)Koro-sensei is a teacher for class 3-E of Kunugigaoka Junior High School and the main antihero of Ansatsu Kyoushitsu. He was responsible for carving out a large chunk of the moon to become a permanent crescent moon and plans to destroy the earth after teaching class 3-E for a year.
His name comes from Korosenai (殺せない) means "cannot be killed" and sensei, means teacher. Literally, his name means unkillable teacher.
Assassination, the art of silent killing. From ancient ninjas with knives to modern hitmen with sniper rifles, assassins have played a dark, prevalent role throughout human history. However, anime assassins tend to be slightly more capable than your average real life assassin...be very scared.