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?
Making friends with you people 
was never part of my plan.
Desde un principio no tenía intenciones 
de llevarme bien con ustedes.
Nunca tive a menor intenção de 
fazer amizade com vocês.