3-E, also know as the End Class of Kunugigaoka Middle School. Though this school isn't normal at all. Their principle judges people on how they do their studies, their P.E teacher is a government official named as Karasuma-sensei, their English teacher is a well know professional Assasin that is even called a bitch by her own students! And last but not least, their teacher Koro-sensei is the one who destroyed 70% of the moon and is currently teaching 3-E their studies. Now, the students in the main building don't know this at all, and because 3-E is separated from them, the main building students attack them with insults everyday. Everybody hates them. Except one. Her name is Yuki Oōkami. She is a student from Class 3-A. She is known throughout the school for being so kind and beautiful to everybody. Even to Class 3-E! One day, Yuki decides she has had enough of staying in class 3-A and decides to move. What'll happen?