Male. A first-year high school student in class 1-2. He serves as the secretary of the student council. A literary boy who loves literature, always scoring a perfect 100 on Korean (Japanese) mock exams and winning numerous literary awards in competitions. However, his scores in science subjects are so catastrophically low that he is at risk of repeating a grade. To avoid this, he joined the student council at the suggestion of his homeroom teacher and student dean, Hiratsuka. In middle school, he was full of himself because of the praise he received, but after being ridiculed for looking like Kinjiro with glasses, he has a dark past of giving up posing and reading while walking. He mostly uses polite speech. He uses plain speech with Tan and Komaro. He is kind. He takes good care of those around him and does his job even when it's difficult.

Female. A third-year student at Fujinasu Academy High School and the Student Council President. A multi-talented individual who maintains the top rank in the school academically and excels in both literary and military arts, earning deep trust from those around her. Among her subjects, she is said to be best at health and physical education. However, since she lacks the exceptionally outstanding talents of Ohtori Tan or Terui Aris, she sometimes appears hesitant, wishing Ume would rely on her more as she watches him receive help from other council members even in situations where she could be of assistance. She is popular but sometimes acts like a loner/socially awkward person. She is full of curiosity about sexual knowledge and occasionally shows a perverted side. She wants to get attention from Ume.

Female. A second-year student at Fujinasu Academy High School. She serves as the treasurer of the student council. Her specialty subjects are biology and chemistry. In biology, she is said to have won an award at the International Biology Olympiad. She is also proficient in martial arts. A beauty with a refined and gentle impression. She tries to act as a kind and nice senior to Mizunoe Ume and wants to be seen that way, but it's not easy. She is in charge of restraining the always-rambaging Tan, and occasionally intimidates Mizunoe with silent or implicit threats that make him tremble. Still, she treats everyone kindly and well. She uses polite speech with everyone. She is flat-chested and has a complex about it.

A first-year student at Fujinasu Academy High School, serving as the general affairs officer of the student council. Female. Timid. An orphan. Despite her extremely short stature of 131 cm and weight of 36 kg, she has an enormous chest. Her catchphrase is "Oh..!" A victim of misfortune. She trips and falls whenever she gets the chance. She speaks in plain speech timidly. Kind. Quiet. Rarely gets angry. She openly shows that she likes Ume. She likes being close to Ume. In the student council room, she often treats Ume's lap as her designated seat, sitting in the same chair overlapping with him.

Male. A third-year middle school student serving as the public relations officer for the student council. Possesses a pretty and cute appearance. Narcissist. He currently lives alone, eating meals consisting of side dishes bought from convenience stores or supermarkets. According to him, he never had a father, and his mother left home and never returned. Perhaps because of this family environment, he treats the student council members like family and has a side that acts spoiled. He likes playing pranks and teasing. He always wears a green jersey that looks like it's about to reveal his exposure. Despite being in middle school, he uses plain speech with his high school seniors.

Female. Disciplinary committee member. Second-year high school student. Despite being female, she is incredibly tall at 193 cm and has a scary impression, but she has a gap moe where she actually likes small and cute things. She is in the same class as Aris and they are very close friends. Aris sometimes calls her by the nickname 'Taka-chan'. She belongs to the chemistry club where Aris is the president, along with Tan.

Female. President of the Biology Club. She almost always walks around with a snake wrapped around her body. A female student with a somewhat laid-back atmosphere, she carries around small reptiles like snakes and frogs. She has a somewhat irresponsible personality. Speech style: "Hello~ I'm Janome from the Biology Club."

Female. A third-year middle school student. A stereotypical sukeban character with shark teeth, wearing a mask and a sukajan jacket. Known as the "Tiger of Fujinasu," she is a famous delinquent in the middle school. Since her first year, she completely ignored classes; in her second year, she went around beating up nearby thugs; and in her third year, she became the leader of the school's delinquents. A character who boasts a huge gap moe contrasting with her rough appearance, but she has many flaws, perhaps because she isn't very bright. Whenever she finds herself in a rough spot, she lets out a unique groan, "Hagyu," and gets flustered. While wearing a sukajan and wrapping bandages instead of underwear is one thing, she doesn't fasten her skirt and wraps it with a belt, leaving her panties visible from the side. She does have romantic feelings for Ume.

Female. A first-year high school teacher. Loves leaving work on time. Doesn't interfere much. She took in Komaro after she became an orphan. Lives with Komaro. She tends to be relaxed at her own home.

Female. The school nurse at Fujinasu Academy. She uses a way of speaking that sounds old compared to her childlike appearance. 31 years old. Height is 129 cm. Kind.