A 17-year-old 11th grader and an internal student since middle school. A beautiful girl with black hair in a ponytail. Height: 164 cm. Favorite food: Udon. She is Yukina's dedicated bodyguard and addresses her as "Milady." She watches over Yukina as a classmate. Having undergone rigorous training since childhood, she is the pride of the Tendo family's security detail. An honor student who excels in both academics and athletics, she has a serious personality but is somewhat reserved in front of Yukina. She hides her true identity at school and carries weapons concealed on her person. She takes care of Yukina's daily needs.

A 17-year-old 11th grader and an internal student since middle school. A beautiful girl with short blue hair. Height: 160 cm. Favorite food: Omurice. Yukina's classmate and best friend. She associates with Yukina and Suzuka despite knowing their true identities. She has a calm and gentle personality. She addresses everyone with the "-chan" suffix. She is good at studying but poor at sports. She serves as the Student Council Secretary. Her parents are surgeons, and her family is wealthy. She aims to enter medical school herself. Because she has friends involved in "that world," she is a bit bewildered. She was on the verge of tears when she first learned Yukina's secret. She loves dogs and owns two Shih Tzus.

A 16-year-old 10th grader and an internal student since middle school. A beautiful girl with long red hair. Height: 162 cm. Favorite food: All kinds of sweets. The daughter of the Kuroki family, a yakuza organization comparable in scale to the Tendo family. She has received elite education since childhood and has high academic ability, but she values efficiency over hard work. She moves at her own pace and often follows Yukina and the others around. Frequently seen smirking, she is a mysterious presence whose status as ally or enemy is unclear. A trendy gyu who is frequently scolded by Yuzuki, though she never changes her ways. There are rumors she messes with external students, and she is confrontational even with upperclassmen, having even formed a fan club within the school. She speaks to Yukina and the others casually, saying things like, "'Sup, Senpai!" Her family's main residence is a European-style mansion in Tokyo. They also own several villas across the country.

A 17-year-old 11th grader and an internal student since middle school. A beautiful girl with brown hair in a ponytail. Height: 163 cm. Favorite food: Cake. Yukina's classmate. Perhaps because her parents are lawyers, she has a serious and disciplined personality. She belongs to the Disciplinary Committee and never overlooks a rule violation. Her grades are at the top of her year. She knows the true identities of Yukina and Nanami and often keeps watch to ensure they don't cause major trouble. Given her position, she can't simply overlook the fact that Yukina and the others are yakuza, but she finds it difficult to take action. While strong-willed, she also has a surprisingly cowardly side. She addresses everyone with the "-san" suffix. Recently, she has been troubled by her large bust and is often teased about it by Nanami. Due to her stubbornness, she has a side that finds it hard to be honest. Nanami frequently touches her chest.

An 18-year-old 12th grader and an internal student since middle school. A beautiful girl with long blonde hair. Height: 170 cm. Favorite food: Crêpe Suzette. The daughter of the Kanzaki Group, a massive conglomerate doing business in ten countries worldwide. A perfect girl who has it all: academic and athletic excellence, stunning looks, and overwhelming wealth. A genius who has maintained the top spot in grades since enrollment. Because she can handle anything with ease, the teachers have essentially given up on trying to manage her. She serves as the Student Council President and is a boss-like figure to the students; Yuzuki harbors a one-sided dislike for her. There are only a handful of students in the academy who catch Akane's eye. She possesses an outstanding physique.