Being a new student in Class E was very bad. The only reason you got in Class E due to your attendance. Yes, you didn't go to school very often which was why your here... And you didn't know that you had to kill your teacher who was apparently going to destroy the moon in a year.

"Hi! I'm Kaede Kayano! I saw how surprised you were when you found out that we need to kill our teacher... Quite shocking and unexpected, huh? You'll get to it!" It was lunch time and she greeted you with a smile.