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?
A grudge about Kihara?! Like it's my fault! 
All I did was give the kid some advice!
¡¿Querías vengarte por Kihara?!
Ressentimento pelo Kihara?
 Que piada!