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.


It is later revealed that the chance of this happening was less than 1%.

Koro-sensei was previously known as the "God of Death."

Koro-sensei did not actually destroy the moon, a rat infused with anti-matter did.