Shirai is a student in the protagonist’s high school and an art club member, distinguished by her dark brown ponytail, matching dark-brown eyes, and oval-framed glasses. Her attire adheres strictly to the school uniform’s guidelines, presenting a polished, conventional appearance. While her surname—formed by the characters for "white" (白) and "well" (井)—hints at potential symbolic roots, its relevance to her characterization remains unaddressed in existing materials. Official records outline no specific personality traits, narrative contributions, interpersonal dynamics, or arcs, leaving her role defined solely by her visual traits and club affiliation.