A mysterious creature destroys 70 percent of the moon. The creature warns that if he is not crushed by March of this past year, then Earth is going to soon be next. The creature demands he becomes the homeroom teacher for tier e-class in Kunugigaoka Junior High School. The government is helpless to say . The creature then becomes the homeroom teacher of 3rd tier E class which consists of failed students involving Nagisa Shiota (Ryosuke Yamada). The creature is called Teacher Koro. The federal government asks that the students try to kill Teacher Koro though he possesses super powers. The federal government delivers a 10 billion yen reward for whom ever kills him. The circumstance confuses the students, but decide to kill Teacher Koro. The students finds themselves with a good time, As soon as their class begins with Teacher Koro.