Alisa Mikhailovna Kujo, known to those close to her as Alya, is the central female character of her story. She is a first-year student at Seirei Private Academy, an elite school in Japan, where she immediately establishes herself as a top-tier student. Her background is a blend of two cultures, as she is the daughter of a Russian father and a Japanese mother, and she spent a significant portion of her childhood in Vladivostok, Russia. This upbringing has made her equally fluent in both Japanese and Russian, a skill that plays a crucial role in her daily life.

Alya possesses a strikingly beautiful and ethereal appearance that sets her apart. She has long, silver hair, which she often styles into a distinctive half-ponytail, and captivating sapphire-blue eyes. Her complexion is notably fair and milky-white, a feature that contrasts with her Japanese peers, and she is tall with an elegant, hourglass figure. It is mentioned that her hair was blonde in her younger years before naturally transitioning to its current silver hue. Her mixed heritage results in facial features that harmoniously combine her father's sharpness and her mother's softness, contributing to her reputation as one of the most beautiful girls in her grade, a status that has earned her the nickname the Solitary Princess.

Her personality is a study in contrasts, fitting the archetype of a tsundere who is often cold and harsh on the outside while hiding warmer, more vulnerable feelings within. On the surface, Alya is an honor student who consistently ranks first in her class and excels in sports. She serves as the treasurer of the student council, a position she handles with competence and seriousness. Her demeanor towards most of her classmates is reserved and distant, as she prefers to keep people at arm's length. This aloofness is not born of simple arrogance but from past experiences. During her time in Vladivostok, she became disillusioned with the lack of motivation in her peers during group projects, leading her to believe that relying on others would only lead to disappointment. As a result, she developed a perfectionist streak and a habit of doing everything herself, which only served to isolate her further.

However, this icy exterior thaws considerably when she interacts with her seatmate, Masachika Kuze. Towards him, she is frequently harsh and critical, especially of his lazy, unmotivated attitude towards school, which stands in stark contrast to her own diligence. Yet, it is precisely Masachika who receives her attention and affection. Unable to be fully honest about her growing feelings, Alya uses her native Russian as a shield and a secret weapon. She often murmurs sweet, flirtatious, or genuinely heartfelt confessions in Russian, believing that no one around her can understand her. This allows her to express emotions she would never dare to voice in Japanese, creating a private channel for her affection. Unbeknownst to her, Masachika is fully fluent in Russian, adding a layer of dramatic irony to their interactions.

Her motivations are driven by a desire for recognition and a need to prove her self-worth. Her primary goal is to win the upcoming student council presidential elections. For her, this is not merely a title but a way to validate her hard work and capabilities on a public stage. Having felt isolated by her own success, she seeks an achievement that forces others to acknowledge her efforts. She is highly competitive, jealous, and possessive, particularly when Masachika interacts with other girls, though she struggles to admit these feelings even to herself.

Alya's key relationships shape her journey significantly. Her relationship with Masachika Kuze is the most important, evolving from simple annoyance at his laziness to a deep, if unacknowledged, love. He is the only one who sees past her flawless facade, and his unexpected moments of insight and capability challenge her worldview. Another crucial relationship is with her older sister, Maria Mikhailovna Kujo, whom she calls Masha. In contrast to Alya's sharp personality, Maria is more easygoing and warm. Alya refuses to call her "big sister" due to her Russian upbringing, where such terms imply a dependency she dislikes, preferring a nickname instead. There are hints of a complex past, as Maria shares a history with Masachika that Alya is initially unaware of.

Throughout the story, Alya undergoes notable development. Her initial, rigid belief that she must do everything alone begins to crumble as Masachika consistently proves to be a reliable and capable partner. Through his influence and support, she starts to learn the value of teamwork and begins to open up to others, slowly shedding her "Solitary Princess" persona and developing her leadership and social skills. While she remains a competitive perfectionist, she becomes more willing to rely on those she trusts.

Alya possesses several notable abilities. Her most distinctive is her bilingualism, which she uses for private romantic expressions. Academically, she is a genius, consistently outperforming her peers even after transferring to a new country with a different test system. Her talents extend beyond the classroom, as she is a skilled athlete and an excellent singer, having performed as a lead vocalist for a band at a school festival. Her organizational skills and intelligence make her a highly effective student council treasurer.