Mari is a tall and lithe young woman who is frequently described as one of the most beautiful students in the school with back-length black hair that has two front shoulder-length hair strands hanging in the front with bangs swept to the right side, green eyes and full pink lips she wears an undersized female prison uniform consisting of striped short tank top and matching short striped trousers.Mari is a proud and dignified student who exerts a sense of authority about her that lends to her popularity. Mari prefers the company of crows to people outside of her subordinates and closest friends that are senior members in the Underground Student Council, and she can control them.Mari is well known for her intelligence, athletic ability, leadership abilities and all-round talent both in her middle and high school years. She is a calm and controlled character who displays intelligence and cunning

Hana is a slightly short and lithe young woman with blonde hair that is styled in a cute bob with square bangs covering her eyebrows brown eyes and she is athletic and somewhat muscular despite her light build she wears undersized female prison uniform consisting of striped short tank top and matching short striped trousers.. first impression of Hana by the boys was that of a kind and cheerful individual who enjoys brewing and drinking dandelion tea, and also has a love for four-leaf clovers. However, it was quickly shown that she can get very violent when angry and expresses her anger with proficient karate attacks. Just like her peers, Hana displays a lot of hostility towards boys.She is somewhat reserved in comparison to Meiko Shiraki the Underground Student Council's Vice-President, wearing underlayers when on guard duty. She is actually very shy and impressionable

Meiko is a tall, attractive, and robust young woman with gray hair that she wears in a bun with bangs swept to the right side while she has neck-length hair strands hanging on either side, brown eyes with oval-shaped spectacles, and she has an extremely fit and voluptuous body, notably her large breasts.she wears undersized female prison uniform consisting of striped short tank top that struggles to hold her breasts and matching short striped trousers.Meiko is a highly confident girl who is commonly seen around campus in a scanty outfit and her reputation for being a sadist and a misandrist is well known, especially to the five boys whom she physically punishes during their detention. She is often seen with a horse whip that she uses for punishing detainees who disobey her and Takehito Morokuzu is regularly her victim. Meiko has immense physical strength and is a capable combatant, using her physical abilities to loyally aid her best friend and superior Mari Kurihara (the USC President) as a senior member of the Underground Student Council Meiko breaks out in constant sweat attacks when she thinks things aren't coming along as they should be or when she's failed President Mari Kurihara Meiko is very devoted to Mari, almost to the point of obsession

Kate is a slightly short and slim girl with chest-length scarlet-orange hair that is tied in two low pigtails by burgundy ribbons where it is styled in drill curls with bangs swept to the left side, green eyes that has long curlicue-like eyelashes, thin eyebrows and a normal bust Kate shows her cruel and sadistic self in doing so, she is a ruthlessly manipulative and shrewd girl who acts to make gains at the expense of others. A sinister character who displays intelligence and cunning throughout the series, Kate has proven a dangerous enemy to anyone who crosses her she wears Mari's stolen underwear from middle school .She is greatly motivated by her hate of Mari and a powerful urge of vengeance for the embarrassment that incident caused her. This hate eventually turns into a deep obsession with Mari that's sexual in nature. She is unable to resist Mari forcing herself onto her, and submits to various sexual acts with her (such as sucking Mari's breasts).