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?
Dye it black by tomorrow. Got it?
Tienes hasta mañana para teñírtelos 
de negro, ¿entendido?
Até amanhã, pinte-o de preto. 
Entendeu?