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?
As usual, when nobody's watching, 
you turn it down a notch, huh?
Eu sabia. Você fica numa boa quando
 não tem ninguém perto, não é?!