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?
Did you do all of this to 
settle a personal grudge?
¡¿Hiciste todo esto solo para llevar 
a cabo una venganza personal?!
Você fez tudo isso para ter
 sua vingança pessoal?