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?
He didn't talk to anyone about it 
because he was afraid of retaliation.
Él nunca le contaba a nadie por 
temor a que se vengaran, pero
Ele tinha medo da retaliação, 
então não pedia ajuda a ninguém.