Assassination Classroom - 暗殺教室
Description:
When a mysterious creature chops the moon down to a permanent crescent, the students of class 3-E of Kunugigaoka MiddleSchool find themselves confronted with an enormous task: assassinate the creature responsible for the disaster before Earth suffers a similarfate. However, the monster, dubbed Koro-sensei (the indestructible teacher), is able to fly at speeds of up to Mach 20, which he demonstrates freely, leaving any attempt to subdue him in his extraterrestrial dust. Furthermore, the misfits of 3-E soon find that the strange, tentacled beast is more than just indomitable—he is the best teacher they have ever had!

Adaptedfrom the humorous hit manga by Yuusei Matsui, Ansatsu Kyoushitsu tells the story of these junior high pupils as they polish their assassinationskills and grow in order to stand strong against the oppressive school system, their own life problems, and one day, Koro-sensei.

某一天,月球突然發生爆炸,約有七成都蒸發掉了。自稱是犯人,還揚言明年三月連地球也要炸掉的超生物,不知何故來到了國中教室,還說要在此擔任教師一職。擁有超越人類的智慧,連軍隊也殺不了的這名怪物,讓各國首腦不得已決定將暗殺任務委由這一班……椚丘國中三年E班的學生們。酬勞是一百億日圓!放牛班「End(無望)的E班」的學生們,能否趕在畢業前殺了這名暗殺對象的教師「殺老師」!?