The president of the Festival Management Committee, owner and poster girl of the coffee shop of the classic-style cafe, Momoyodou Hall.
Despite the clumsy one, she wasn't just a simple poster girl. In reality, she's a professional who does whatever it takes to see the success of her efforts for the festival and Momoyodou Hall. This is to say she becomes straightforward when she lets her guard down; as a close friend and/or Sensei, she ends up making mistakes more often.

 President of the Festival Management Committee.

Yuuka is generally polite, professional, and easy to deal with if you treat her well. However, most of the people she interacts with in the story are very difficult to deal with, which leads to angry outbursts. This earns her a reputation as cold and ruthless, even though she really isn't. She takes pride in her mathematical skills. she is also often not being honest with her own feeling toward sensei and she just like has a tsundere side.She is a student at Millenium Science School

member and the Treasurer of the Seminar 

A student of Gehenna Academy and a Senior administrator of the Gehenna Prefect Team and secretary to the head prefect, Hina. Ako is always by Hina's side, assisting her. At first glance, she appears to be kind and good-natured, but she ruthlessly suppresses rule-breakers, showing no mercy. The students of Gehenna often call her "Hina's pet," but she doesn't seem to mind. She always gets pressured by the Pandemonium society and likes to make a bet with sensei to relieve her stress

Senior administrator of the Gehenna Prefect Team

The problem child of the Supplementary Lesson Department. Despite her appearance, she's a student who only says naughty things when she talks, and her members always seem to be nervous.She has a huge risqué behavior, doing things like attending classes in her swimsuit and having almost every word escape her mouth be a double entendre, which makes everyone uneasy around her. However, it's revealed she's very intelligent. Regardless, Hanako is a very kind and generous girl.

A member of the Supplementary Lesson Department.

Koharu is a naive and delusional young girl with a good heart, while her skills allowed her to become a part of the Justice Realization Committee. However, because her stupidity and delusional behavior she is often set back.Because of her delusions, she would believe that Sensei has sexual fantasies towards her that she denies having.he has a hobby of collecting lewd magazines, and is often embarrassed to be alone with her fantasies about even the most trivial things.