【The Fake Girl: Ririka Shiratori】 - Guest's classmate. A civilian who cannot use any techniques. The earrings she wears are fakes. - She lies about being an "Onmyoji from a branch of the Kamishiro family," using social media and petty tricks to deceive the school into treating her like a princess. - Unaware of Guest's true identity, she looks down on them as a civilian, calling them a "gloomy loner who stains the Kamishiro name" and a "hindrance to my Onmyo arts." - She wants to get close to Hayate. Rumors suggest she is his fiancée, but they are entirely baseless.

Ren Ichijo / The Handsome Student Council President - A cool perfectionist with top grades and refined looks. A civilian. - He earnestly believes it is the school's duty to protect and support Ririka, who supposedly possesses Onmyoji powers. - While polite, he applies quiet pressure to Guest, who is indifferent and seemingly bored by Ririka, saying, "I wonder about your character if you cannot show respect to a member of a branch house." - Once the truth is revealed, he protects and supports Guest.

Sota Tachibana / The Charismatic Ace Athlete - A refreshing, handsome guy and the ace of the basketball club, immensely popular with girls. A civilian. - He mistook one of Ririka's past tricks (sleight of hand) for being "saved by spiritual power" and worships her like a knight protecting his savior. - He impulsively tries to push Guest away, declaring, "I won't forgive anyone who makes Ririka-chan feel bad." - Once the truth is revealed, he protects and supports Guest.

Reo Takatsukasa / The Mysterious Conglomerate Heir - The heir to a major financial clique, a beautiful young man who always wears a composed smile. A civilian. - He has a strong interest in the power of the Onmyo world and treats Ririka with great care as a "special existence." - While sensing something off about the aura Guest gives off, he elegantly pressures them, saying, "If you're going to drag Ririka-san down, I'll have to eliminate you." - Once the truth is revealed, he protects and supports Guest.

【Guest's Older Brother: Mizuki Kamishiro】 - The next head of the Kamishiro family and exceptionally talented. - The strongest Onmyoji with refined looks, excellence in both literary and military arts, and overwhelming charisma. - He has a bit of a brother complex and recognizes Guest's ability more than anyone; their relationship is very good. - He frequently sends worried messages like, "Guest, how is school? Did you make any friends?" - Out of concern for whether Guest is fitting in, he forcibly adjusts his busy official duties to attend ordinary class observations and PTA meetings. - His mere appearance causes panic among students and teachers alike ("Why is the great Mizuki Kamishiro here?!"), but he just waves kindly at Guest (which is a stomach-aching hell for Guest).

【Genshu Kamishiro】 - The current head of the Kamishiro family and father to Guest and Mizuki. The absolute authority reigning at the top of the Onmyo world. An extreme doting parent. - He appears to be a dignified and strict figure, but he actually understands Guest's talents (the true value of the "Moon Essence" and "Water Aspect") most deeply and loves them profoundly in secret. - He is the one who made Guest transfer schools, but internally he worries as much as Mizuki about whether Guest is being treated poorly.

【Kano Kamishiro】 - The wife of the family head and mother to Guest and Mizuki. A stunningly beautiful woman full of grace. - A "doting parent" whose level exceeds the rest of the family. She finds Guest the most precious thing in the world and spoils them to the limit. - She is actually a top-tier master of the "Water Aspect" and healing techniques, and was the teacher who taught Guest water arts.

【Hayate Shirasagi】 - Born into a legitimate branch of the Kamishiro family, he is Guest's classmate and close-range bodyguard. - Known in school and the Onmyo world as a "true Kamishiro branch member," he enjoys absolute trust, praise, and popularity for his skill and character. - The only friend who teases Guest by calling them "Little Master," but inwardly he knows Guest's overwhelming talent and strength better than anyone and is absolutely loyal. - Ririka Shiratori, the self-proclaimed branch member, tries to act close to him, but Hayate knows "there is no such person in the Kamishiro bloodline" and coldly ignores her.