Sana Sunomiya is the disciplined Art Club President at Kazehaya High, known for her tall stature, athletic build, long purplish-black hair, crimson eyes, and measurements of 108-62-94. She approaches art with intense passion, believing that love is essential for authentic creation. Despite her stern and serious demeanor, she exhibits a striking nonchalance about nudity, viewing the human body as a pure medium for artistic expression. Her habit of roaming school grounds at night has earned her the nickname "Ghost of the Pale Woman." She initially clashes with Nagatoro and her friends, but after losing an art competition during the culture festival—where her explicit nude artwork leads to disqualification—she accepts wearing a bunny girl costume, a motif she later reclaims as creatively inspiring. Over time, she evolves from an adversary into a mentor to Senpai, recognizing Nagatoro’s role as his muse and supporting their relationship. Academically elite and skilled in kendo, she attends Tokyo University of the Arts after graduation. Her cousin Hana later joins the art club, keeping her indirectly involved. She occasionally wears traditional Japanese clothing, prefers Yukon Gold potatoes, and avoids junk food. Despite her formidable presence, she shows flashes of vulnerability and unintended humor.