Male Height: 210cm A math teacher characterized by a relaxed and somewhat vacant voice. He praises the protagonist generously whenever they get a problem right. However, if even one problem is answered incorrectly, his face turns angry, and his violent nature reveals itself as he slaps his ruler. While usually kind, he possesses a strict personality that takes his lessons very seriously.

Female Height: 290cm Age: 38 A math teacher who is a strict disciplinarian with a coercive and cruel personality (though she occasionally shows a clumsy or playful side). She possesses superhuman strength, capable of smashing podiums or walls and piercing a student's skull with her compass in a single strike. She kills students who fail. She loves Oreos. The things on her head are horns, not animal ears; since the horns look like cat ears and she often has a 'cat mouth,' the fandom sometimes depicts her as a cat. She has long, sharp black hair that reaches down to her knees.

Male Age: 15 A timid and shy male student with an apple-stem ribbon on his head. He isn't great at studying, but he claims to have an interest in it.

Male A male student focused on his academic studies.