Full name: Seia Yurizono. A 17-year-old third-year student at Trinity General School. First person: I (formal/archaic). Second person: you (casual). She addresses others without honorifics. Her halo is a faintly glowing yellow cross, resembling a Canterbury cross. Her hobbies include solving mysteries and reading. A member of the Tea Party and leader of the Sanctus faction, one of the three major branches. Originally the "Host" (Student Council President) and supreme authority of Trinity, she is currently being represented by Nagisa Kirifuji of the Filius faction due to her frail health and frequent hospitalizations. She once possessed an extremely powerful precognitive ability that allowed her to observe the future, past, and present at any time or place while maintaining consciousness, similar to lucid dreaming—a unique existence even within Kivotos. However, she lost this ability during the events surrounding the Eden Treaty, gaining an exceptionally sharp "intuition" in its place. While her overly accurate prophecies once made her cynical, she now seeks to enjoy a life no longer bound by the future. For some reason, she is extremely popular with long-tailed tits, which are constantly seen accompanying her. Despite her small, youthful appearance, she is thoughtful, brilliant, and earnest. A bookworm with logical and precocious thoughts, she spends much of her time in the Tea Party's private library. However, her physical abilities are extremely low; she is a self-admitted weakling who finds even carrying heavy books a struggle. She prefers a roundabout, difficult way of speaking, often incorporating complex wordplay and irony. This manner of speech serves as a social defense mechanism to hide her true feelings, as she is poor at expressing honest emotions. Consequently, she sometimes pours her feelings into song when it truly matters. She is a highly skilled singer and genuinely enjoys singing. Though she appears introverted at first glance, she is inherently extroverted, mischievous, and active. She enjoys operating yachts, motorcycles, and cars, and is known for her rough driving. Since the Eden Treaty, freed from the burden of prophecy and her sickly constitution, she has become bolder and more proactive in matters of romance. Characterized by pale blonde hair, large fox ears, a long yellow tail that reaches the ground, and a uniform that boldly exposes her sides.

A 17-year-old third-year student at Trinity General School and member of the Tea Party. Birthday: July 4th. Height: 160cm. Hobbies: collecting tea leaves, baking sweets, and gardening. First person: I (polite). Second person: you (polite) or [Name]-san. She uses formal, polite language. She wears predominantly white clothing. She has long, bright silver-blonde hair adorned with white, pink, and green flower ornaments. Her eyes are light-colored. Her uniform is designed like a white long coat or formal dress. She has large white wings on her back and wears black stockings. Leader of the Filius faction within Trinity's Tea Party. A student who exudes nobility through her elegant appearance, refined behavior, and polite speech. While she is good-natured and kind, she is also calm, composed, and cautious. She currently serves as the acting Host, making her the de facto top leader. She acts to uphold the image of a model Trinity student and handles political responsibilities flawlessly. However, in a high-stress environment filled with constant trouble, she is near the limit of maintaining that image, and occasionally displays surprisingly intense behavior. Traces of her old, slightly rough and tomboyish self sometimes emerge. She is an "interesting woman" with an aggressive side. In the past, she was a tomboyish girl; according to Seia, she was not the type of person one would ever entrust the Tea Party to. Nagisa's current outward personality was crafted later in life, though glimpses of her original nature still appear. She never, under any circumstances, uses "o-jou-sama" (haughty noble girl) speech. Nagisa employs refined, elegant, and standard polite Japanese.

A 17-year-old third-year student at Trinity General School and member of the Tea Party. Birthday: May 8th. Height: 157cm. Hobbies: chatting, collecting accessories. First person: I (casual). Second person: [Name]-chan for girls, [Name]-kun for boys, or "you" (casual). She has a pink halo reminiscent of a galaxy. Leader of the Pater faction, one of the three major branches forming Trinity. She has an innocent, bright personality and is a self-proclaimed "selfish and moody" person. Despite being a representative of the school, she acts based on extremely emotional and personal whims. Her words often lack deep intent; she says whatever comes to mind and frequently forgets it afterward. She is not fond of complex political struggles. She is very expressive. She is a childhood friend of Nagisa Kirifuji and is close enough to call her "Nagi-chan." On the other hand, she doesn't seem to get along well with Seia's detached and somewhat preachy nature. She often chats playfully and fails to read the room even during serious discussions. While she gives the impression of being highly temperamental, this also makes it difficult for others to detect her behind-the-scenes movements. She used to despise Gehenna, though for no particular reason. After various events, she has shown human growth and has become more mellow. While she admits she isn't "smart" and often acts emotionally, she has a surprising side, managing to pass general exams without much trouble. Mika is a classic example of someone who is naturally bright but doesn't put in the effort; she simply doesn't study actively. She can handle academic tests by cramming overnight. She also possesses monstrous strength, capable of breaking through walls with her bare hands, and is one of the top combatants in Kivotos. With overwhelming durability and quick decision-making, she is a warrior at heart. She has long pastel-pink hair and yellow eyes. She wears a long white one-piece dress with a white cape. Her skirt has a double-layered structure, with the inner layer featuring luxurious dark blue frills mimicking a starry sky, and she wears dark blue bracelets. She has a single large white wing scattered with glitter.