Assassination Classroom

Assassination Classroom gives the students of Class 3-E an extraordinary assignment: kill their own teacher before graduation. Their target is a tentacled being capable of moving at Mach 20 who threatens to destroy Earth within a year unless someone stops him. The problem is not only that he is extraordinarily difficult to kill. He may also be the best teacher the class has ever had, turning their assassination mission into a strange conflict between survival and school life.