Every episode from the first two seasons of the Japanese anime based on the manga series by Yûsei Matsui. After destroying 70% of the Moon, a seemingly indestructible, tentacled creature threatens to wipe out the Earth in similar fashion within the year. The planet´s only hope lies with the young students of Class 3E at Kunugigaoka Junior High School, where the creature has been assigned to teach, who have been chosen to learn the art of assassination from their new, tentacled teacher. Will they succeed in despatching the one they call Koro-sensei (voice of Jun Fukuyama) before lessons are over?