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?
An accumulation of everyday 
stress exploding? The fool.
Conque al fin explotaron 
tus frustraciones, tonto.
Explodiu por conta do estresse
do dia a dia? Que idiota.