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?
Wearing it is convenient when punishing 
wrongdoers in a number of ways.
Porque tenerlo es conveniente a la 
hora de castigar a los criminales.
É conveniente vesti-la ao punir 
de várias formas os malfeitores.