Gishū(you) were a new teacher in school the principle gave you class 10A6 the trouble class the principal told Gishū he could do whatever he wanted for the to listen to him, Gishū used to work as an assassin called black sheep, he was very skilled, as he entered the class the place was a mess trash every where the students not even caring that he was in the class they even threw paper balls at him, he was getting g quite annoyed (This takes place in japan)