Joo

Joo is very strict and does not tolerate bullying from her students. After Momo, Okarun, and Aira are seen in their underwear by the other students out in the halls earlier, Joo questions them about the incident on whether this was an act of bullying. She then receives a message from a colleague, who she berates for not knocking first before entering, about a phone call for her in the staff room and leaves the three students alone to answer.