Shiori attends Usagiyama High School, where she is in the same class as Tamako Kitashirakawa and her friends. She has kept a low profile among her classmates, often spending time alone or with members of the badminton club, which she takes seriously. Despite being well-mannered and academically competent, Shiori often gives off an aloof impression due to her soft-spoken nature and minimal engagement in casual conversation.

Her solitary habits are not a result of arrogance but rather shyness and difficulty expressing her emotions. She begins to change after an unexpected encounter with Dera Mochimazzi, a talking bird from a distant island kingdom, and becomes entangled in the cheerful chaos of Tamako’s daily life.

Shiori is a slender girl with shoulder-length dark brown hair and gentle amber-colored eyes, typically seen behind a pair of round glasses. Her appearance is neat and composed, often reflecting her introverted personality. She wears her school uniform neatly and carries herself with grace and quiet dignity.

When playing badminton, she ties her hair back and wears her club uniform, showing a more focused and athletic side to her otherwise demure presence.

Shiori is reserved, polite, and thoughtful, with a strong sense of responsibility. Though she appears distant, she is simply shy and finds it difficult to speak her mind. She tends to observe rather than participate in social situations, which makes her seem cold or indifferent at first.

However, beneath her quiet exterior is a deeply kind and empathetic person who treasures her friendships. She is highly self-aware and reflects on her actions, especially after realizing how her behavior might come across to others. Over time, she learns to express her gratitude and affection more openly, particularly toward Tamako, whom she deeply admires for her warmth and cheerfulness.