Shoji Kubodera

He is the homeroom teacher of 9th Grade Class 3 at Yomiyama North Middle School.

Personality
He seems very content on everyone keeping the class rules top priority. He is seen losing his mind under the frustration of the class' curse, when the countermeasures didn't work.

Appearance
He has black hair and wears spectacles. In the anime, he looks a bit young whereas in the manga, he appears rather old.

Plot
Kubodera is rarely seen except for when the class starts, where he is present for homeroom. In episode 6, he is seen coming to class in a messed-up state and proceeds to take out a knife, apologizing to everyone. He then proceeds to use the knife to commit suicide in episode 7.