Akane Aoi is a first-year at Kamome Academy, distinguished by her vibrant indigo hair styled in two circular buns with loose bangs. She transitions between the school's summer and winter uniforms and is sometimes seen caring for classroom plants. Outwardly cheerful, gentle, and immensely popular, she holds the title "Queen of Popularity," receiving but consistently rejecting confessions with polite phrases like "No♡" or "Impossible♡". Despite professing a dislike for scary stories, she actively shares supernatural rumors with her best friend, Nene Yashiro, suggesting a hidden fascination. She skillfully employs subtle pressure to persuade others, particularly evident in her interactions with her childhood friend, Akane Akane, whom she repeatedly rejects—partly due to the humorous concern that marrying him would make her name "Aoi Aoi".
Beneath this carefully maintained facade lies profound loneliness and insecurity. Akane Aoi masks deep-seated bitterness and resentment, fearing rejection if her true self is revealed. She believes others only value her false persona, viewing herself as fundamentally different, which prevents genuine emotional closeness. This stems from childhood bullying and parental deception, teaching her to suppress negative emotions, compounded by her family's tradition of sacrificing daughters for social status. Academically exceptional, she ranks first with 510 out of 500 points through diligent daily study.
Her involvement with the supernatural reveals greater complexity. She assists the Sixth Mystery, No.6, motivated by a long-held wish to escape far away and avoid exposure. As a kannagi, she wears a teal coat, black hakama, and magenta hair flowers, gaining the power to control insects, notably commanding a giant centipede that grievously wounds Akane Akane. During this confrontation, she tears fabric from her dress to bandage his injury, showing underlying care despite her cynicism. These events grant her the permanent ability to see supernaturals, including Hanako.
A pivotal moment occurs when Akane Akane confronts her, declaring he has always known her true personality—her tendency to look down on others and avoid vulnerability—and loves her regardless. This revelation brings her to tears. Shortly after, she becomes trapped in the Far Shore, expressing regret for never reciprocating his feelings. Subsequent appearances show her moving away from the cheerful facade, though she retains kind impulses like tending to Akane's wound. She reveals personal preferences: liking giraffes (though unseen), disliking crowds, enjoying desserts and games, and taking late-night walks around 2 A.M.
Her relationship with Akane Akane is central, defined by their childhood bond, her repeated rejections of his confessions, and one shared kiss. She questions the sincerity of his feelings, believing them directed at her false persona. A significant argument culminates in him declaring he hates her—deeply upsetting her and echoing a painful childhood incident where those same words made her cry. Ultimately, she acknowledges his unwavering devotion too late, trapped in the supernatural realm with unspoken feelings.