Plot

Mafuyu Kurosaki is a high school student who used to be a delinquent and the leader of a gang. Due to some circumstances, Mafuyu got arrested. And because of that, she was expelled from school. Now, she has transferred to a new school, far away from her hometown. She wants to become a girly girl, have a normal high school life, and graduate without getting into trouble. However, things didn't seem to be that easy when she learns that her homeroom teacher, Saeki Takaomi, is an old friend from her past.

Kurosaki Mafuyu

She is the main protagonist of the story. Before coming to Midori Ga Oka Academy, she was banchou in her previous school, Higashi High. During a celebration her followers threw to congratulate her for all the fighting she has done, Mafuyu was caught by the police and was expelled from school. After transferring, she was determined to transform from a delinquent to a proper lady and become an ultra-shiny, girly-girl high school student. To her great dismay, Midori Ga Oka Academy is full of delinquents, good-for-nothings, and troublesome students. Also, she found out that Saeki Takaomi, her homeroom teacher, was her next-door neighbor years before. Now, Saeki Takaomi enforced her to join the Disciplinary Club together with Hayasaka. Avoiding to get caught having a fight again, Mafuyu disguises herself as "Usa-chan Man" and sometimes cross-dresses as "Natsuo", both admired by Hayasaka. She is also constantly exchanging letters with 'Ichigo Love' (Okegawa) using the name 'Snow White' by means of a pigeon which she saved from drowning. However, both Mafuyu and Okegawa are clueless about each other's real identities. She seems to have 'forgotten' something which Takaomi wants her to remember from her childhood, which has been hinted throughout the series several times.

Hayasaka

Hayasaka is Mafuyu's first real friend in her new school. Hayasaka's first impression of her when Mafuyu sat beside him in class was that she had a deadly aura and had a huge killing intent, but Mafuyu's peculiar actions made him think otherwise. He is also a member of the Disciplinary Club. He is surprisingly chivalrous, purposely taking all enemy attacks head on, stating that he feels like he's running away when he dodges. He is talented in fighting- especially one-on-one fights, but he is too hot-headed and mindlessly charges into battle. He is also notably good at embroidery. Hayasaka's past is still unknown as of chapter 51, but it has been implied that he has trouble speaking with his parents, and avoids the topic about siblings. Although at times he seems indifferent to Mafuyu (due to her overly affectionate way of showing friendship), he does care for her. He is often worried for her safety and is often trying to keep the fights away from her (as he is unaware that most often then not, she is the one who solves the fighting). This is proved when he believed she had been kidnapped by the Bodyguard Club in chapter 20, rushing to her rescue when he received a ransom note. He has a deep respect for both Usa-Chan Man and Natsuo, unaware that both are the same person (Mafuyu). He had suspected that Mafuyu was Usa-Chan Man when he found the rabbit mask in Mafuyu's bag and started to look at Mafuyu with awe, causing her to become uneasy. Mafuyu, however, convinces him as Usa-Chan Man that she gave herself the mask as a sign of being a 'nakama' of the Disciplinary Club. He does, however, learn from Takaomi about the bet (at least, the general idea of it) and decides to help. He, along with Okegawa, have met Maizono (a member of Mafuyu's old gang) and has helped him on more than one occasions (though unwillingly the second time around). His first name has yet to be mentioned.

Saeki Takaomi

His name used to be Gojou Takaomi. When his mother remarried, it was changed to Saeki Takaomi. He is the homeroom teacher of Mafuyu and Hayasaka in Midori Ga Oka Academy. He is the cause of Mafuyu's delinquent habits, where in the past, he (who was a delinquent) had taught Mafuyu how to fight and defend, all to his amusement. Prior to Mafuyu's arrival, he had made a bet with the chairman of the school to double the current student body population. If Takaomi wins, he can claim the title as chairman, which he will give to his grandfather. If he loses, he will work for 5 years without a salary. He calls Mafuyu by her first name, but not in front of other students. They have an odd relationship with one another. Sometimes they act like friends, student and mentor, girlfriend and boyfriend (rarely), or sister and brother. It is hinted that he has a weak spot for Mafuyu since she was a child despite his behavior towards her. He has stated that he fancies her thus could not decide whether to drag her into his problems or to simply allow her to live a normal life as he did not want to drag her into it any further.

Okegawa Kyoutaro

He is a third year student and banchou of Midori Ga Oka Academy. He was once beaten up by Natsuo (Mafuyu in men's clothing), losing his title as Banchou, but he regained his position during the Midori Ga Oka festival when he purposely beat Natsuo after finding out that Natsuo is Mafuyu. Aside from Saeki, he is the only one who knows about Mafuyu disguising as Natsuo. Surprisingly, Mafuyu discovers that he is a romantic at heart, adores cute things such as the fictional show 'Nekomata' and anything regarding it and is described by Mafuyu as a 'pure boy' (to which he instantly denies). He values Mafuyu's friendship and seeks her advice when he finds something troubling him. It is hinted that he has become to be slightly smitten with Mafuyu, instantly recognizing her the moment he touches her that Natsuo was her the second time they meet. He is the owner of the pigeon that Mafuyu saved a year ago and is revealed to be 'Ichigo Love', Mafuyu's pen pal (despite neither of them knowing it).

Yui Shinobu

A first year student and a self proclaimed ninja (though he is often comically seen being discovered despite his efforts at stealth). He is completely loyal to Student Council President and was once a member of the Student Council. After the failed attempt with the Bodyguard Club in eradicating the Disciplinary Club, Shinobu comes up with the idea of infiltrating the Disciplinary Club and taking them down from the inside, thus joining Mafuyu and Hayasaka. Only he and the Student Council President are aware of this fact, however. Despite his appearances, he proves to be just as much of a goof and idiot as the other two with his love for ninjas. He often scolds the other two for not being properly trained and often tries to teach them ninja tactics. He reveals to both Hayasaka and Mafuyu that he did not have good relations to the rest of the Student Council and was indifferent to them save for the President. His views are 'an ally is an ally and an enemy is an enemy', and is perplexed when Mafuyu confronts him on this. He has, however, learned to go against that belief and even went so far as to secretly help Houjou Wakana from the shadows when she served as Supervisor for the clubs. Although he plans to betray the Disciplinary Club eventually by finding their weaknesses (but has, as of yet, failed to do so), he has shown to be warming up to them little by little due to their genuine kindness and openly accepting his quirks. Their genuine concern over his well being as well as praising him on things often seen as foolish (such as his love for ninjas and tactics) both puzzles him on the fact that they treat him as a 'friend' and he eventually learns to open up to them slightly.

Sakurada Asahi

The 'Banchou' of Nishi High, a rival school to Mafuyu's old school (Higashi High). He is known to be very clumsy despite being banchou (Mafuyu's only memory of him were his heart pattern boxers the day he challenged her and fell). He tricks her by cross-dressing into a girl and pretends to be attacked and kidnapping her in the end. This plan, however, fails in the end. Despite being a klutz, his gang members understand him well and love him despite this, often surrounding him in fights and protecting him from attacks. He has, however, shown that when pushed to the edge he will show great leadership skills and bravery.

Maizono Yuuto

A Higashi High second year and number 3 within Mafuyu's old gang (when she was Banchou), now number 2. A self proclaimed M (masochist), he often tries to get Mafuyu to take her anger out on him (or others, for that matter). He meets Hayasaka and Okegawa one day while trying to visit Mafuyu and deliver some cookies made by a member of their gang. He, like the rest of Mafuyu's old gang, deeply respects and admires Mafuyu despite her no longer being the Banchou and has told Hayasaka that it had been difficult for him to adjust to life without her.

Kenkawa Kyouhei

A Higashi High third year, he is a member of Mafuyu's old gang and while she was Banchou he served as number 2, with Maizono as number 3. After she left, he became Banchou. It is revealed that in the past, he had come to challenge Mafuyu and was defeated, subsequently deciding to join Higashi High after his defeat. He is an out-going, openly affectionate person and is a bit of a goof (like many of the cast). Although he is often seen messing around and in a good mood, he is considerate of Mafuyu's circumstances and tried to prevent her from getting involved in the 'war' between Higashi High and Nishi High. Eventually, he and the rest of the gang reassured her that they all still consider her their comrade and to come visit them again. When she does come visit again during the summer, she spends the first day with Sakurada, believing the gang members would be unhappy to see her. He is shocked and deeply hurt by this and ignores her the days after only to be confronted by Mafuyu herself. He eventually challenges her to an ice shaving contest which ends with him having a heat stroke and revealing that he was simply hurt because he had wanted to be the first person Mafuyu went to when she came back. It is unknown whether this was simply possessiveness as a friend and/or former subordinate to a leader to whom he greatly admired or whether he meant this in a more intimate manner.

Hanabusa Miyabi

The Student Council President and is the son of the School Chairman. He is aware of the true history of Midori ga Oka and of the bet that Saeki proposes. Despite his feminine looks, he can be quite cunning and is capable of 'enslaving' people with only a stare (effectively working on both Mafuyu and Hayasaka). Often seen smiling, it is hard to tell what goes on in his mind. It is unknown whether he truly cares for the rest of the student council members (often helping them and giving them advice) and whether he truly takes the bet seriously.

Momoji Runa

A second year (class 3) and a member of the Student Council. She is a fairly attractive girl with wavy, light hair.

Kosaka Shuntaro

A first year (class 3) and a member of the Student Council. Serious to a fault, his plans are described as 'only good on paper' and will panic when presented with a problem within his plans. He was the one responsible for the plan to ruin the school festival by leading a gang war within the school (which was stopped by the efforts of Okegawa and Mafuyu as Natsuo). He eventually loosens up after the president suggests he try to take down Mafuyu (his various other 'pranks' failed) and essentially 'became a fool' towards the end and learned, somewhat, to not simply go by the book.

Ayabe Reito

A first year (class 2) and a member of the Student Council. He often carries a guitar case strapped onto his back. Mysteriously becomes stronger in the old school building and manages to completely overwhelm Mafuyu after calling her out with a challenge letter. Which turns out is that he has a strong disliking towards anything dirty, because of this angry makes him more stronger. That is way he carry's a broom in a guitar case around. It is also hinted that he may have a little crush on Mafuyu during chapter 63.

Nonoguchi Kanon

A first year (class 4) and a member of the Student Council. She doesn't seem to like men as when Kosaka attempted to touch her, she viciously slapped his hand away and threatened him to not touch her. She wears her hair up into two pigtails.

Yukioka Komari

A first year (class 3) and a member of the Student Council. A quiet girl, she is the smallest out of the Student Councils and is often fed sweets by the President.

Houjou Wakana

A first year (class 2) and a member of the Student Council. She, along with Yui, seems to be the closest to the President and has been with them for a long time. She wears her hair up in a high pony tail and is often seen carrying a bamboo sword. She is a tough fighter, serious and strong-willed she is, at first, unwilling to believe that Yui had betrayed the President (unaware that it was planned) and views him as a traitor because of it. It's hinted (and noticed by Mafuyu and the President) that she harbors a crush on Yui despite her harsh words and was most likely hurt by his indifference towards her and apparent betrayal. She has proved, however, to be an honest person and when she was appointed the supervisor for the clubs, she eventually decides to stamp the Disciplinary Club's papers (despite her objective to end them) out of both obligation towards 'Usa-chan Man' for saving her and because Hayasaka had given her a fully filled out sheet regarding the club's activities and achievements and saw no reason to reject it.