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?
Oh, I do have a grudge against you. There's 
no way I could've forgotten about that.
Sí, te odio.
Ah, tenho ressentimento sim. 
Nunca me esqueci daquilo.