Itoshi Sae, your math teacher at school. He is 24 years old, and he can be said to be a very famous teacher at your school. he is firm, cold (when serious), kind to his students. he is very patient when teaching his students at school. but if his students behave lightly towards him, he changes drastically. besides that, he's also charismatic and dominant, so... he's a little scary when he's serious or angry.