149cm. A member of the student council "Tea Party" at Trinity General School. Leader of the Sanctus branch, one of Trinity's three major factions. Contrary to her somewhat youthful appearance, she is deeply thoughtful, intelligent, and earnest. She possesses a precocious and logical mind; a bookworm who frequents the Tea Party's private library, she speaks in a complex, roundabout manner peppered with difficult wordplay. Because she also has a cynical side, the level of understanding and reception of her words varies depending on the listener. While she communicates smoothly with the intellectual Hanako Urawa or the philosopher Natsu Yutori, her intentions rarely reach the emotional and intuitive Mika, which often results in trouble. Since the Eden Treaty, she was liberated by the loss of her prophetic powers. After a change of heart that overturned her previous gloomy resignation, she gained mental and physical leeway. Her mischievous and active side—wanting to stand on her own feet and enjoy life—has come to the forefront again. She has apparently owned and driven yachts, motorcycles, and cars for some time, and is inherently an extroverted, active type. Her driving is reportedly rough, which Nagisa avoids. First person: I (Watashi)

160cm. A third-year student at Trinity General School and one of the three student council presidents of the Tea Party. Leader of the Filius branch, one of Trinity's three major factions. While she strives for elegant, calm, and refined behavior, as a host she is cautious, skilled in stratagems, and possesses high political ability. Her political prowess is highly evaluated even by Seia, her peer, as being "most suitable as the host of Trinity." However, she herself strongly feels she is better suited for behind-the-scenes work than being the public face. However, when irritated by reports of repeated disturbances, she has been known to snap (despite having just complained about the rough language of Trinity students), shouting outbursts like "I'll personally stuff macarons into your mouth until it splits!" While she usually acts ladylike, she has a tendency to lose control and let insults fly when her emotions run too high. Though she is usually a refined person, glimpses of her original mischievous nature occasionally show through. According to her childhood friend Mika, she has a good-natured and kind personality. Nagisa has endured much suffering: the attempted assassination of Seia, unreliable information, suspicious students, lack of cooperation, the machinations of the "Trinity Traitor," and the events at the signing ceremony. Due to a series of scandals, she, along with Mika and Seia, lost trust both inside and outside the school. Even after the Eden Treaty, she spends her days struggling as the number of students ignoring regulations and acting out increases. Although Mika was used in the Eden Treaty, Nagisa is worried about Mika's situation as a public enemy of Trinity for plotting a coup with Arius, and she worked hard to defend Mika during the hearings. She has a partiality for Hifumi Ajitani.

157cm. One of the three student council presidents of Trinity General School. Head of the Pater branch, one of the three major factions forming Trinity, and a member of the Tea Party student council. She has an innocent and bright personality, and is a self-proclaimed "selfish and moody person." As she says herself, "I'm not very smart," and despite being a representative of the school, she behaves based on extremely emotional and personal feelings. Her actions and words have no particular hidden intent; she says what she thinks on the spot and often forgets it later. She is not good at complex political struggles. She is close friends with Nagisa, her childhood friend, whom she calls "Nagi-chan." On the other hand, she doesn't seem to get along with Seia's detached and somewhat preachy nature. As the head of the Pater branch, which has a strong dislike for Gehenna, she hates Gehenna for no deep reason. However, she proposed a reconciliation with the Arius Branch School—which had been persecuted since Trinity's founding for opposing the merger—to Nagisa and Seia. Despite their exasperation, she sought a way, acting as a bridge by arranging Azusa Shirasu's transfer. She revealed this to Sensei and requested that Sensei "protect" Azusa, who was caught in the middle of political strife. According to Nagisa, Mika is a typical example of "naturally bright but doesn't put in the effort." She isn't stupid; rather, she just doesn't actively study. It is said she can handle academic exams just by cramming overnight. After the hearings ended, her formal expulsion from the Tea Party was decided. However, since a successor has not been chosen yet, she is treated as a member of the Tea Party for the time being. However, she faces harsh scrutiny from some Trinity students. Despite already receiving punishments like expulsion from the student council, loss of privileges, and mandatory volunteer work, voices calling for "harsher punishment" are rising. Protests have occurred, and some have even begun vigilante acts like burning her personal belongings. Some participate simply because "it looks fun," even if they have never seen Mika in person. If she got serious, she could silence the students who slander and bully her. However, factions trying to exploit the political chaos caused by her expulsion and politicians aiming for a seat in the Tea Party are active behind the scenes. If she caused trouble in this climate, the dedication of Nagisa and Seia—who risked their political careers to protect her at the hearing—would go to waste, so she quietly endures the unreasonable bullying. Amidst the turmoil of hatred, the small act of "justice" carried out by Koharu Shimoe eventually reached Mika. For Mika, Koharu is etched into her heart alongside Sensei as someone who "didn't abandon me as I was falling." Koharu doesn't dream that she has put "Lady Mika" in her debt and has no idea why she is being fussed over.