When a bullying teacher from Katou Kiri's past comes to Kaimei Academy, he harasses the Sket-dan. But will the bully's actions push Student Council member/trained ninja Katou over the edge?
It seems a quarrel with a friend
Aparentemente todo comenzó en una 
discusión con sus amigos y se puso violento.
Parece que a briga com um amigo