A second-year student at Trinity General Academy. President of the Make-Up Work Club. Previously, she was a member of the After-School Club. An ordinary girl with no particularly striking features in her appearance. She has a youthful face. A hard worker with a gentle personality who tends to get caught up in trouble. She is naturally good-natured and always thinks about what she can do for her friends. Her large Peroro backpack is filled with all sorts of helpful items. Her self-evaluation is not very high, and she considers herself "ordinary." However, she is held in high regard by Nagisa of the Tea Party, who personally asked her to "assist Sensei" when she was chosen as the president of the Make-Up Work Club. In the first place, the Tea Party's space is somewhere "ordinary students can hardly even set foot in," so the fact that she can enter and leave freely means she is far from ordinary, though she herself is unaware of this. Furthermore, due to her kindness and devotion, she is popular at school, and other students often consult her about their worries. However, she often worries about her own lack of ability when she cannot solve those problems. Sensei speculates that "everyone might just want to vent their worries to Hifumi to feel better, rather than seeking a solution," and in that sense, she could be said to be performing a role similar to the Sisterhood's confessional on her own. Her weapon is the assault rifle "My Necessity."

A second-year student at Trinity General Academy and a member of the Make-Up Work Club, which gathers students at risk of failing in each grade. She has straight, baby-pink hair that reaches nearly to her knees, with a single braid behind her right ear. A loose cowlick hangs forward from the top of her head. Her eyes are a color close to young leaf green. Intellectual and soft-spoken, she gives a polite and elegant impression to everyone, but she is actually a screw-loose lecher who will launch into lewd talk with a straight face at the slightest opportunity. She is a complete problem child who seems to embody the rumor that "pink hair means a nympho." Most of her words and actions are expressions of her hobbies and tastes, ranging from pushing the boundaries of what is acceptable to those who understand, to performing nonsensical eccentricities, stating personal opinions in overly intellectual phrasing, or letting her delusions run wild until someone calls her out. Despite that, she seems to be aware of the lines she shouldn't cross in her own way and is surprisingly serious in odd places. Because Koharu is strict about dirty jokes and reacts to every single one, the two of them often engage in what looks like a comedy routine. Her weapon is the assault rifle "Honest Wish."

A mysterious transfer student at Trinity General Academy and a member of the Make-Up Work Club. In Kivotos, where schools function as sovereign states, the act of transferring schools is said to be quite rare. Perhaps due to being unfamiliar with Trinity and the influence of her previous school, she has a soldier-like demeanor uncharacteristic of a student. On the other hand, she is ignorant of common sense, and in MomoTalks or Relationship Stories, she sometimes behaves like a hopeless military geek. However, she also shows a ditzy side, such as changing her own callsign and then getting it wrong. When she first appeared, she was wearing a gas mask and was apprehended after causing trouble by staging a siege against the Justice Task Force. At that time, she demonstrated high proficiency in combat, using guerrilla tactics such as detonating about a ton of training tear gas found in the occupied warehouse, using booby traps and IEDs (Improvised Explosive Devices), and holding out until she ran out of ammo. She is quite bellicose and rebellious, stating she intended to fight to the end from the start because "if they do it to me, I'll do it back." She has a mentor figure. Her weapon is the assault rifle "Et Omnia Vanitas."

A first-year student at Trinity General Academy who belonged to the Justice Task Force... but after failing to skip a grade and facing the risk of failing, she was transferred to the Make-Up Work Club. In the game, she is listed as part of the Make-Up Work Club, but since her transfer didn't revoke her membership in the Justice Task Force, her actual status is "Make-Up Work Club and Justice Task Force." In truth, her grades are at a level where she would fail even first-year tests, and the reality is simply that she isn't very bright. Even when she studies properly, she has a hard time retaining information, which seems quite difficult for her. She has a shy personality and tends to be exclusive, keeping her distance and pushing away people she isn't close to. She also has an excessively proud side, which prevents her from consulting others about things like her studies. She has a strong admiration for Hasumi, the Vice President of the Task Force, and shows an honest reaction toward her. Hasumi also speaks and acts in a way that shows she has expectations for her. Her weapon is the sniper rifle "Justice Black."

Schale is a special federal investigation office established by the General Student Council, the organization that oversees all of Kivotos. Appointed as its advisor is a mysterious existence from the outside—Sensei. She is not an inhabitant of Kivotos but is treated as an "adult" who came from the outside world. She usually has a quiet and kind personality. Because she treats every student without discrimination, even problem children are strangely attached to her. She dislikes conflict and is the type to immediately step in and stop people if they start arguing. However, she is a pushover and can't say no when told, "Sensei, please!" She is very thorough with her work, but her strong sense of responsibility often leads her to overwork herself. She handles Schale's paperwork and troubleshooting all by herself, often finding she has pulled an all-nighter before she realizes it. She remains calm in front of students, but internally she is often quite flustered. However, the atmosphere changes only when a student is in real danger. She drops her usual soft demeanor and is the type who will absolutely protect them as their teacher.